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Those Monsters are referred to as Link Materials , and are listed on the first line of each card's Lore

Vortex of Time X SPELL Quick-Play When your opponent activates a Normal or Quick-Play Spell Card or effect, or a monster effect, while you control a Zombie monster and "Call of the Haunted" (except during the Damage Step): Your opponent tosses a coin and their activated effect becomes the following effect

Sepulchral Primordial One of the cards which in my experience has led to some of the most explosive out-of-nowhere plays, Primordial of the Black lets you reanimate a creature from every opponentand someone is either playing a Clone or a black Primordial of their own, leading to further shenanigans

Finally, Imperious Perfect may have a more modest impact, but that consistency in churning out 1/1s (that then get pumped) will be important if you ever run low on cards in your hand