Cyclopean Tomb [International Collectors' Edition] Artifact that player taps an untapped

that player taps an untapped artifact

000 Type: Legendary Creature — Demon Primarch Rarity: Rare Cost: {5}{B} Flying

Set: The Lord of the Rings: Tales of Middle-Earth Showcase Scrolls Type: Legendary Artifact — Equipment Rarity: Mythic Cost: {2} Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard

this is a good place to start

Then if you control three or more creatures with different powers

Cyclopean Tomb [International Collectors' Edition] Artifact that player taps an untappedSet: International Collectors' Edition Type: Artifact Rarity: Rare Cost: {4} {2}, {T}: Put a mire counter on target non Swamp land. That land is a Swamp for as long as it has a mire counter on it. Activate only during your upkeep. When Cyclopean Tomb is put into a graveyard from the battlefield, at the beginning of each of your upkeeps for the rest of the game, remove all mire counters from a land that a mire counter was put onto with Cyclopean Tomb