Siren's Call [30th Anniversary Edition]

Siren's Call [30th Anniversary Edition]Set: 30th Anniversary Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy all non Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.

you may convert Ratchet

Set: Platinum: Rising Rivals Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

or even its guilds

it's a vault of secrets

Set: Prize Pack Series One Type: Colorless Rarity: Ultra Rare

trash up to 3 cards from your hand

fruitful places

feeding off the flowing power

Set: Commander Legends Type: Sorcery — Arcane Rarity: Common Cost: {2}{G} Search your library for up to two basic land cards

• 27 Majestic

but I believe a more mundane power source might suffice

Set: 30th Anniversary Edition Type: Artifact Rarity: Rare Cost: {2} Whenever a land enters the battlefield