4 Covetous Dragon
Teros Maze pacified my angel, but as soon as I found another one with my Sylvan Library, the game swung in my favor and, eventually, I took down the match
Or even to your plan against decks with powerful two-card engines, where you need to try and put them on the fastest clock you can early, and then time your discard spells to keep them stuck on (at most) half a combo
Then, when the creature enters the battlefield, you create a token copy of that creature for each time its Squad cost was paid
Tolarian Academy was also part of a cycle of cards from Uzras Saga
In the greater context of the game, these cards might be useless 99% of the time, but amazing the 1% of the time they matter