Mass Polymorph is my usual win condition: I purposely only run three creatures in the 99, so when I cast this spell, I can generate infinite mana and spell recursion through Peregrine Drake, Deadeye Navigator, and Archaeomancer
Twiddle A classic cheap blue spell surpassed by Dream's Grip, Twiddle is a key part of so-called Twiddle Storm decks which pair effects like these with card draw and spells like Wish, Underworld Breach, and Grapeshot
However, it also makes good use of one of the deadliest secret weapons Magic has: Poison
Prized Amalgam gets trimmed if Im cutting so many creatures that itll be hard to return or if my opponent is very bad against Bloodghast, such that I dont even need the help
Our commander will understandably be a removal magnet, both in the mid-game as we start stacking serious experience counters on it, and in the late-game when it will just spell game over
Brainstorm remains a cornerstone of many blue card advantage engines