surging sparks - booster box Pokemon sv08 revealing a parade of dragon Pokémon led by the towering Alolan Exeggutor ex A Surging Sparks Booster Bundle

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Speaking of pump effects, you should prioritize landing mutate creatures on top of infect creatures when possible

The archetype even includes a mysterious artifact called the Forbidden Trapezohedron that can Summon the cosmic horrors directly from the extra deck if you meet the conditions

Water Web Holofoil: The usual holofoil pattern from Sun & Moon to Cosmic Eclipse, meant to resemble flowing water waves

As this ability resolves, the battle's controller exiles it then casts the back face from exile without paying its mana costand there won't be a mana cost, so that part's easy