mtg unfinity cards legal in commander Can I use an card a deck? Whenever you put an ability sticker on a creature Standard Procedure | Unfinity |

Following that logic, the idea of removing Wyleth before it can attack is something everyone at the table will think of, so you need to include multiple cards to prevent that

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The more you get, the more abilities Rex comes into play with, and you're almost always up cards in the exchange

Fog certainly has its weaknesses