Siphon

Cast only with all green or all white mana.
Tap all Green and White colored creatures on the field. You gain live equal to their combined power or toughness depending on the color of mana used to cast this card. There can only be 2 of this card in a deck.
If cast with white: You gain life equal to tapped creatures' combined toughness.
If cast with green: You gain life equal to tapped creatures' combined power.
Exile Siphon.