Tasha provides card draw and exiles instants and sorceries to be used later with her negative ability
Whatever the strategy to running, as long as your deck is prepared for it, youll usually win the game on the spot once you play this powerful black instant
This lead to a rebalancing so you can no longer do it
The completest in me wanted to give Tibalt, the Fiend-Blooded a slot, but I just envisioned using his +1 ability to draw a card and then randomly discarding Teferi, Temporal Archmage, and that was just unacceptable
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The Map token also has proven to be quite useful either as sacrifice fodder to other effects or also being used to explore with creatures