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What about untapping your Mosswort Bridge on your opponent's turn right after you played it, or drawing more than one card with War Room

In some unusual cases, they might, and if they do, use the copiable values of the creature at the time the permanents enter the battlefield

With Crucible of Worlds, Dryad of the Ilysian Grove, or Ramunap Excavator, those costs become repeatable advantages

If I had to wager, I would say Zirda had the biggest potential to be broken, what with the Training Grounds impression it's doing and all that

As if having access to a virtually unlimited amount of counterspells wasn't enough, Glen Elendra Guardian even offers card draw with its two mana ability, which practically pays for itself through it's -1/-1 enter ability