mtg phyrexia all will be one green cards Nissa, Ascended Animist [Phyrexia: One] All Will Be One (ONE) #169 Illustrated by Yeong Set Name: Phyrexia: All Will

These enchantments maximize your efficiency and turn modest creatures into massive, game-winning threats

It has a nice solid 80% kill rate and has some of the best early game control and reliability

Swords to Plowshares is not what you might consider as a life gain card but a good number of games have been saved and then won with the Plowing of your own guy for life, not ideal situations but better than death and all from a card you were playing purely as a removal spell

It's not exhaustive, but this is a good starting point: Counterspell Craterhoof Behemoth Cyclonic Rift Delighted Halfling Dismember Fable of the Mirror-Breaker Giver of Runes Goldspan Dragon Grief Lightning Bolt Ocelot Pride Ragavan, Nimble Pilferer Reanimate Snapcaster Mage Swords to Plowshares The Wandering Emperor Thoughtseize Titan of Industry Topiary Stomper I also want to give you some uncommon and common staples, which are largely ramp pieces or interaction

For two blue mana you get a 1/3 Merfolk Wizard that checks for you devotion to blue, the number of blue pips on permanents you control in play, when it enters the battlefield

This, alongside a mana neutral rock like The Great Henge, can create infinite colorless mana