Teferi's Puzzle Box

This land enters tapped. As it enters, choose a color other than blue. T: Add U or one mana of the chosen color.

(T: Add U.)

T: Add C.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Chandra's Pyrohelix deals 2 damage divided as you choose among one or two targets.

Whenever equipped creature attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)

Other Merfolk creatures you control get +1/+1. T: Target Merfolk creature can't be blocked this turn.

Target player sacrifices a creature of their choice.