Doomsday (Invocation) [Amonkhet Invocations] XY44 or a monster effect is

or a monster effect is activated: Pay 1500 LP

You can only use this effect once per turn during your Main Phase

Set: Duel Terminal 4 Card type: Effect Monster Rarity: Common Attack: 2800 Defense: 2400 You can Special Summon this card from your hand by removing from play 1 face-up Dragon-Type monster you control

Set: Tournament Pack 2 Card type: Ritual Spell Rarity: Rare This card is used to Ritual Summon "Skull Guardian"

Set: Cybernetic Revolution Card type: Effect Monster Rarity: Ultimate Rare Attack: 2400 Defense: 1000 Discard 1 card from your hand

Doomsday (Invocation) [Amonkhet Invocations] XY44 or a monster effect isSet: Amonkhet Invocations Type: Sorcery Rarity: Mythic Cost: {B}{B}{B} Search your library and graveyard for five cards and exile the rest. Put the chosen cards on top of your library in any order. You lose half your life, rounded up.