Cruel Ultimatum

Target player sacrifices a creature of their choice. Flashback 5BB (You may cast this card from your graveyard for its flashback cost. Then exile it.)

+2: Look at the top card of target player's library. You may put that card on the bottom of that player's library. 0: Draw three cards, then put two cards from your hand on top of your library in any order. −1: Return target creature to its owner's hand. −12: Exile all cards from target player's library, then that player shuffles their hand into their library.

Add BBB.

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

T: Add C. XRG, T: Target creature gets +X/+0 and gains trample until end of turn.

Defender When this creature enters, draw a card.

Destroy all artifacts, creatures, and enchantments. Cycling 3 (3, Discard this card: Draw a card.)

Changeling (This card is every creature type.) Protection from black 2GG: This creature gets +X/+X until end of turn, where X is its power.