Gonti's Aether Heart [Aether Revolt Prerelease Promos]Set: Aether Revolt Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {6} Whenever Gonti's Aether Heart or another artifact enters the battlefield under your control, you get {E}{E} (two energy counters). Pay {E}{E}{E}{E}{E}{E}{E}{E}, Exile Gonti's Aether Heart: Take an extra turn after this one. Despite the magic that sustains Gonti's life, the crime lord is often described as heartless.

counter it

destroy Cosmic Horror unless you pay {3}{B}{B}{B}

Set: Arena League 2000 Type: Sorcery Rarity: Rare Cost: {1}{R}{R} Destroy target artifact or land

At the beginning of each player's upkeep

Set: Commander 2018 Type: Legendary Planeswalker — Windgrace Rarity: Mythic Cost: {2}{B}{R}{G} +2: Discard a card

(They can't be blocked as long as defending player controls a Forest

Set: Shadowmoor Type: Enchantment Rarity: Rare Cost: {1}{W} Other enchantments you control have shroud

Summoned from the dreamrealms

If an effect causes you to discard a card

Trostad villager

Set: Kaladesh Prerelease Promos Type: Enchantment Rarity: Mythic Cost: {3}{U}{U} Whenever you cast an instant or sorcery spell

Set: Masters 25 Type: Artifact Rarity: Mythic Cost: {X}{X} Chalice of the Void enters the battlefield with X charge counters on it