Gacha System

{2}: Flip a coin until you lose a flip. You may play
a randomly chosen card from your deck with a
mana cost equal to each coin flip you've won
without paying its mana cost. If you have no card
of that mana cost in your deck, a card with a
mana cost that is closest and lower to the
coin flips you've won is chosen instead.
"It's not gambling, it's surprise mechanics!"