With where the format is currently, I value instant speed interaction highly, so my top choices for this slot are Natures Claim and the phenomenal newcomer, Cankerbloom
Many decks have completely omitted it from their strategy in favor of faster summoning methods, but theres one deck left that dares to make it work Monarchs
Now, we move into the modern era, beginning with Sun & Moon
Previously, Rakdos decks relied on options like The Cruelty of Gix, Coiling Rebirth, or Push // Pull, which could be cast on turn five or six
Creature Enchantment - Horror Svyelun of Sea and Sky Svyelun has indestructible as long as you control at least two other Merfolk
But while Infernoids have a consistent strategy based around their simple summoning condition, Alchemy Beasts revolve around highly specific spells to summon them, with a bizarre banishing gimmick tacked on to the deck via mostly separate cards