Swords to Plowshares [Unlimited Edition] Cat you'd need the energy of

you'd need the energy of the giant's tonic

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

It's a matter of strength

Set: Mirage Type: World Enchantment Rarity: Rare Cost: {1}{G}{G} At the beginning of each player's upkeep

Its controller gains life equal to its power

Swords to Plowshares [Unlimited Edition] Cat you'd need the energy ofSet: Unlimited Edition Type: Instant Rarity: Uncommon Cost: {W} Exile target creature. Its controller gains life equal to its power.