The Gatekeeper

Indestructible, Hivemind 2

Whenever a Cultist or Cultleader enters the battlefield under your control, you may put a shield counter on it.

You may put cultist and cultleader spells from exile
to the battlefield. But instead of paying their mana costs you lose 10 life. Spells you put on the battlefield this way have shroud until your next turn. Activate as an instant and only once each turn.