New Shaman Spell - Hagatha's Scheme

Schemes are new cards that upgrade each turn they lay in your hand. Save them for amazing effects!

What does upgrade do? it looks like shaman is getting a new exciting board clear i am excited because there is no overload!!!!

Upgrades each turn means that it adds it's original effect to the current one each turn.

A card that would summon a minion for this reason summon another of these minions each turn that is has been in your hand.

(Also i predict that Rafaam's Scheme is gonna summon 1/1 Imps)

Does this upgrade each turn regardless? 

It makes no mention of upgrading only whilst in hand! pulling it on turn 20 and having a full board nuke would be pretty mad. (a cheaper twisting nether essentially)

I would assume it only upgrades while in hand

This card is gonna be insane for any control shammy deck

This may be insane in arena as well.

I don't like those cards too much cause you need to wait a while before they are good.. terrible top deck/discovery option while looking for outs..

but it's a strong aoe.. will see how it goes.