MTG Salvation

Whenever you cast your first spell each turn, reveal the top card of your library. You may cast it without paying its mana cost if it’s a spell with lesser mana value. If you don’t cast it, put it into your hand.

Whenever you cast your first spell each turn, reveal the top card of your library. If it's a nonland card with converted mana cost less than that spell's, you may cast it without paying its mana cost. If you don't cast the revealed card, put it into your hand.

Whenever you cast your first spell each turn, reveal the top card of your library. If it's a nonland card with converted mana cost less than that spell's, you may cast it without paying its mana cost. If you don't cast the revealed card, put it into your hand.