mtg shrine cards card 'The Great Unbinding' explains creature type where X is the number of cards in all graveyards with the same name as that spell. Shrine Steward | Kamigawa: Neon

Sisay, Weatherlight Captain is the most popular leader of this archetype, and I like that option

Even better, it has the Hideaway ability, letting you dig five cards deep into your deck and tuck away a spell, ready to cast it for free later when you meet a particular criteria: in this case, having three creatures with different powers after you tap Collector's Cage

Committing a crime requires targeting something an opponent controls, and they control their own spells on the stack

Toxic Pressure with Karumonix **Karumonix, the Rat King** gives all your Rats **toxic 1**, meaning every Rat that connects gives poison counters

Scaling with the amount of Poison Counters on opponents, Phyrexian Swarmlord can create oodles of Phyrexian Insect Tokens

Tezzeret, Cruel Captain All of Tezzeret, Cruel Captain's abilities are great for artifact decks, but he's mainly on this list of top planeswalkers purely for that -3