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C Common Psychic Omnibuster X WIND Level 7 [ PsychicSynchroEffect ] ATK 2500 DEF 2000 1 Tuner + 1+ non-Tuner Psychic monsters Each time your opponent activates a card or effect on the field (except during the Damage Step): You can pay 2000 LP and declare 1 card type (Monster, Spell, or Trap) (but you can only declare each card type once per turn to activate this effect of "Psychic Omnibuster")

Basically, you sacrifice the artifact, activate your merfolk commander to play it from your graveyard, trigger Mirran Spy to untap your commander, then rinse and repeat as many times as cards you have left in your deck

[Pendulum Effect] Once per turn, when you take battle damage from an opponent's attacking monster: You can activate 1 of these effects

In the case of Gifts Given, it uses cards from your opponent's library, whereas Gifts Ungiven uses cards from your own

Unlicensed Hearse's power and toughness are each equal to the number of cards exiled with it

It's a key piece for certain hatebear strategies on the Reserved List