Kyrah, Shackled by Fright

Rather than pay {2} for each previous time you've cast this spell from the command zone this game, pay 2 life that many times.

Deathtouch, menace, ward—Discard a card.

Humans can't block.

Whenever an opponent casts a spell, that player may pay {2}. If they don't, they discard a card. If the player doesn’t discard a card this way, they mill a card.