Ulamog, the Infinite Gyre [From the Vault: Legends] Viashino Warlock Soul of the Wild's power

Soul of the Wild's power and toughness are each equal to the number of lands you control

return the exiled card to the battlefield under its owner's control

Set: Champions of Kamigawa Type: Legendary Artifact — Equipment Rarity: Rare Cost: {2} Konda's Banner can be attached only to a legendary creature

you may cast a sepll from your hand or the top of your library without paying its mana cost

Which tell us the way to go

Ulamog, the Infinite Gyre [From the Vault: Legends] Viashino Warlock Soul of the Wild's powerSet: From the Vault: Legends Type: Legendary Creature Eldrazi Rarity: Mythic Cost: {11} When you cast this spell, destroy target permanent. Indestructible Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.) When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.