Innocuous Researcher
From Murders at Karlov Manor Commander set
Innocuous Researcher
Creature — Centaur Detective
3/4
Parley — Whenever this creature attacks, each player reveals the top card of their library. For each nonland card revealed this way, you investigate. Then each player draws a card.
At the beginning of your end step, you may untap all lands you control. If you do, you can't cast spells until your next turn.