Your opponent cant play Supporter cards from their hand during their next turn
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Not only do you get a sizable 2/2 for two mana, but you also get one of the best abilities put on a Rebel this side of the actual search mechanic
But you can still tap any of your summon-sick creatures either as part of the cost or as part of the effect of another card, like a convoke or improvise card
Most modern land animation gives the animated lands haste to mitigate this issue
As Commanders progressed, Ive become less and less interested in universal card draw in my group hug decks, so I prefer Howling Mine variants that give you control over the card draw