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This is pretty sweet card advantage for green, and with a mana discount in multiplayer commander games, you'll be ripping some massive creatures off the top in no time
Note that if a card is exiled and then "gains suspend," only the two triggered abilities are relevant
Dredge doesn't put a spell or ability on the stack for counterspells to target, and you can't stop the dredge once it happens, the same way you wouldn't be able to counter the draw your opponent would've had instead