Bloodbound Gambit

Until end of turn, the top card of the library is revealed. You may cast the top card of the library at instant speed by paying life instead of mana, 1 mana = 10 life.

You can pay 5 life to put the top card of the library in the graveyard.

You can pay excess life than the amount you have to cast a spell this way once, if you do set your life to 1.