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Oath of Druid: One of the most iconic cards in all of Magic, and the centerpiece of a deck, the 'Oath Deck.' Give your opponent a small creature, and then you can cast Griselbrand

Short of an immediate removal spell, it's hard to see how you lose a game with this transformed creature in play

Here's how you could use it

(It didn't really feel like our opponent overpowered us

I won't go deep into each one, but they all have some form of cycling which can be a boon if drawn later in the game when you don't need them, or, of course, for cycling strategies (toss in a Fluctuator and burn through your whole deck.) Some produce colorless or single-color mana