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Gev gives creatures +1/+1 counters so long as an opponent has taken damage during the turn, so creatures with persist, such as Murderous Redcap, Puppeteer Clique, and Putrid Goblin, go infinite with any sac outlet

Secondly, it destroys the opponents card summoning another monster from the extra deck available

The fact that the second card is so loosely restricted, and Force is so universal (and technically hard-castable) makes it playable in any fair blue deck, and so gives a large portion of the format the necessary panic button to discourage super-aggressive combo

And it is typically based on changes in the game's balance or mechanics