Loki, the Deceiver

Whenever Loki enters the battlefield, target
player reveals their hand. You choose one
nonland card from it and add that card to your
hand. You may use mana as though it were mana
of any color to cast that spell.
{2}{u/b}: Return Loki and target creature blocking
or being blocked by Loki to their owners' hand. Neither creature deals combat damage this turn.
Each creature's owner draws a card.