From the control side of things Dimir (Blue/Black) and Azorius (Blue/White) control make up the bulk of decks according to mtgtop8.com
Vigilance Example For example, lets say I control [c]Murasa Rootgrazer[/c]
It's a fairly straightforward concept, and it can be activated at instant speed
You choose which cards that you are playing from exile as you play them, not as March of Reckless Joy is resolving
The same can be said for The Countdown Is At One, as it doesnt give any one player an unfair advantage
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