Its a first-spell only effect, but thats fair for a 3-mana enchantment
It's just higher than the creatures since that's a ton of stuff and in colorless so any deck can add it or cast it
But it also fits perfectly in control decks, where this land can consistently be flipped to let you find powerful non-creature spells to put you in the driver's seat of any game
Compatible with common deck list formats
Lifegain isnt an archetype and its hard to gain much life off of this
Mono-Black Conqueror with Bloodthirsty Conqueror 2 Anoint with Affliction 4 Bloodletter of Aclazotz 3 Bloodthirsty Conqueror 2 Cut Down 4 Deep-Cavern Bat 2 Duress 2 Enduring Tenacity 1 Go for the Throat 2 Mirrex 2 Preacher of the Schism 1 Sheoldred, the Apocalypse 1 Soulstone Sanctuary 2 Starscape Cleric 22 Swamp 4 Unholy Annex // Ritual Chamber 4 Unstoppable Slasher 2 Virtue of Persistence 1 Bladecoil Serpent 1 Cut Down 1 Darkstar Augur 1 Deadly Cover-Up 1 Duress 3 Ghost Vacuum 2 Liliana of the Veil 1 Liliana, Dreadhorde General 2 Malicious Eclipse 1 Outrageous Robbery 1 Sheoldred, the Apocalypse Alongside the old favorite of Rakdos Pact, Foundations has also brought in a new combo revolving around Bloodthirsty Conqueror, which triggers whenever your opponent loses life, allowing you to gain a life in return