Chameleon Colossus

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.

Target opponent sacrifices a creature of their choice, discards three cards, then loses 5 life. You return a creature card from your graveyard to your hand, draw three cards, then gain 5 life.

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.)