After running it with coworkers came up with this (snowing we’re bored).
Kalista 3M
2/4 Fearsome
Play or attack: Grant an ally +1/+0
Strike: If I die revive me at end of round.
Level up - I’ve seen 3 allies die.
4/4 Fearsome
Play or attack: Grant an ally and I +1/+0
Stike: If I die revive me at end of round.
I like that you're thinking outside the box on this, but it's not clear how the "Play or Attack" would resolve, since it can grant "an ally" (rather than all allies) but there's no opportunity to target things with "Attack" abilities today.
Also, I don't really get why your version revives herself. The distinguishing features of Kalista in League seem to be:
She turns an allied Champion into her Oathsworn at the start of the game
Her Pierce and Rend abilities enable her to kill an enemy and immediately start stacking up damage on the nearest target
When she and her Oathsworn attack the same target, she deals extra damage
Her ult teleports her Oathsworn to her to deliver a big hit to a Champion and all enemies in an area
Kalista is explicitly not a support hero because her role is ADC/Marksman (i.e. she should be able to go on offense)
From a flavor/fantasy standpoint, I think the existing Kalista really checks a lot of those boxes. Some problems, though, are that you don't really want to use her on offense or she'll die before she levels up, and the bond isn't permanent.
What about this:
In this version, the bond is permanent, so things like recall don't leave you stuck with two meh units when you replay the bonded unit. It also buffs both of them when they're both in play. So, Kalista is still vulnerable to a fair number of damage-based removal spells, but so long as her Oathsworn is in play she's a bit sturdier than she is today. Additionally, her level-up condition has changed to be focused on enemy deaths, as she is much more focused on killing enemies one after another in LoL.
I've made the suggested change. I wanted it to reflect the adjacent minion dying, which would suit the flavour more, but I realised there's a very....iffy result if you target Xav with something like Shadows of Death, or play multiple copies followed by N'Zoth. Essentially you would have a chain reaction that would last for ages, while not really having much effect.
Blizzard would have to build in a hard stop on the chain reaction, like how Defile can only go fourteen times before it fizzles out. But even then...yeah. Probably for the best not to let it happen in the first place.
I think the flavor is still there to some degree, so you haven't lost everything in the process.
My personal favorite standard ''Infinite'' combo is playing Shudderwock with a bunch of token already into play, after I already played 2x Faceless Corruptor & Barista Lynchen, giving a few Shudderwock copies back to your hand ; rinse & repeat!
[Game] Card Treasure Hunt (The Resurrection Attempt)
That was a good one, and the pachyderm pun was a big lol when I realized
Two cards:
With a big smile
Robust and sly
Big comes first
Then the little ones
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
The cutoff point has to be somewhere! There are at least a dozen objectively cute cards from the past year lol
Kalista tweaks
I like that you're thinking outside the box on this, but it's not clear how the "Play or Attack" would resolve, since it can grant "an ally" (rather than all allies) but there's no opportunity to target things with "Attack" abilities today.
Also, I don't really get why your version revives herself. The distinguishing features of Kalista in League seem to be:
From a flavor/fantasy standpoint, I think the existing Kalista really checks a lot of those boxes. Some problems, though, are that you don't really want to use her on offense or she'll die before she levels up, and the bond isn't permanent.
What about this:
In this version, the bond is permanent, so things like recall don't leave you stuck with two meh units when you replay the bonded unit. It also buffs both of them when they're both in play. So, Kalista is still vulnerable to a fair number of damage-based removal spells, but so long as her Oathsworn is in play she's a bit sturdier than she is today. Additionally, her level-up condition has changed to be focused on enemy deaths, as she is much more focused on killing enemies one after another in LoL.
Pole Position - Card Design Competition Discussion Thread
Blizzard would have to build in a hard stop on the chain reaction, like how Defile can only go fourteen times before it fizzles out. But even then...yeah. Probably for the best not to let it happen in the first place.
I think the flavor is still there to some degree, so you haven't lost everything in the process.
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
I'm voting for Micro Mummy.
But, c'mon Man, not nominating Bronze Explorer? I mean, look at this adorable little Guy! Big smile, great Attitude and he always comes prepared!
A Weekend of Wild Decks
Wow first time with a featured deck 8-)
Blizzard Implements a Work-From-Home Policy due to Coronavirus
For some reasons, my Corona's memes aren't going viral ^^
How Long Can This Go On? - Going Infinite in Hearthstone for Pi Day
My personal favorite standard ''Infinite'' combo is playing Shudderwock with a bunch of token already into play, after I already played 2x Faceless Corruptor & Barista Lynchen, giving a few Shudderwock copies back to your hand ; rinse & repeat!
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
What if a ginger were to vote for it ...?

The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
Brash but accurate ^^
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
By the way, Tasty Flyfish should at least get a special mention.
Kalista tweaks
After running it with coworkers came up with this (snowing we’re bored).
Kalista 3M
2/4 Fearsome
Play or attack: Grant an ally +1/+0
Strike: If I die revive me at end of round.
Level up - I’ve seen 3 allies die.
4/4 Fearsome
Play or attack: Grant an ally and I +1/+0
Stike: If I die revive me at end of round.
How Long Can This Go On? - Going Infinite in Hearthstone for Pi Day
Derpcorn doesn't discriminate. Delicious is delcious!
Hearthstone is Getting a New Art Book Dedicated to the Year of the Mammoth
This was my favorite HS Year of all time, I'm definitely gonna buy that
Sidequest decks
I made up a side quest hunter deck and tried it out a little.
It feels like I've made a slightly confused deck. But it is reasonably fun to play.
Wild · Secret Hunter · by frenzy · 6 years, 6 months ago
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
I think Rising Winds Hatchling is very cute.
Why is this card not getting any mentions?
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
it's okay to be wrong
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
there are many chonkers. There is only one Chonkler.
All Hail the Chonkler
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
Azure Explorer gets MY vote
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
Oh sorry then. I thought it was since its usally said as "Chonker" without the L
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
because the DNC rigged the primaries and the Russians are interfering.
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
it's not a typo, that's just what I call him.
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
I get it was a typo, but "The Chonkler" sounds like a B-rate Scooby-doo villain or something along those lines
Top Hearthstone Decks to Climb the Ladder This Weekend from HSReplay
Never did I ever expect colossus of the moon to be in the highest win rate deck atm, but I for one, am living for it.
The Cutest Cards from Hearthstone's Year of the Dragon - Community Vote
IDK how the Chonker isn't leading by a landslide right now.