Summoning Portals are to reduce costs from 3 mana minions (like Sn1p Sn4p ;9 ) to 1 mana

Expect nice swing turns with 1 mana echo cards like Phantom militia!

Carpets to rush 1 mana mechs and the reduced 3 mana cards. Kaboom bot with rush makes nice removal.

See it in action:

https://hsreplay.net/replay/T9eibAsL2g7q9UQPcFfHWU