Doomsday

Change the target of target spell with a single target unless that spell's controller pays 2.

You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost. Counter target spell.

Tap an untapped creature you control: Tap target artifact, creature, or land.

Buyback 3 (You may pay an additional 3 as you cast this spell. If you do, put this card into your hand as it resolves.) Return target permanent to its owner's hand.

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay RR. If the player does, they may copy this spell and may choose a new target for that copy.

Add BBB.

Return all lands to their owners' hands.

Counter target spell.