Genichiro, Way of Tomoe

First Strike, Menace
When Genichiro, Way of Tomoe deals combat
damage to a player, you may exile a card from
each of your opponent's graveyards.
Until end of turn, you may play one of these cards without paying its mana cost.
If you don't, Genichiro, Way of Tomoe deals 3
damage to any target.
"Heresy, you say? If it is for the sake of preserving
Ashina, I will seize any manner of heretical strength"