Because all attacking creatures are chosen at once, a creature returned this way can't attack during the same combat as it returns, even if it has haste
One interesting question with GU is how much countermagic you should play
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This is going straight into a bunch of Timeless decks/sideboards Id wager. Now with a cheap spell that cant be countered directly targeting the main crux of the Blue deck, and even getting around Ward (which acts as a counter-spell), it would appear that the recommendations to move to Blue/White or Blue/Black decks has never been louder
With trample, infect, and indestructible, Blightsteel Colossus is either always pushing poison counters through or is taking out multiple creatures a turn to stop it
Pokmon Tools are similar to the video gmaes Pokmon items