Rimo, Spectral Mouser

Flying
When Rimo, Spectral Mouser deals combat
damage to a player, that player reveals their hand
and you create a Blood token. Then, you may
sacrifice Rimo and any number of Blood tokens.
If you do, exile a nonland card from that player's
hand with mana value less than or equal to the
number of Blood tokens sacrificed this way. For
as long as that card remains exiled, you may cast
that card without paying its mana cost.