mtg shrine cards card 'The Great Unbinding' explains creature type Whenever a player casts a spell The Best Shrines in Magic:

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

Card draw like the staple Pawpsicle, Develop Your Brain, and the damage/draw combo of Let The Storm Rage On would fit in nicely

This is my chance to mention Costume Closet, Chameleon, Master of Disguise and Impostor Syndrome because of all the Spider-Man costumes you see every year

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

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

If you can tick both of these boxes, it becomes a truly excellent two-mana draw engine