Since the mechanic was designed as an either/or for other formats, this makes perfect sense for Commander
Vintage tournaments are unsanctioned and allow growing numbers of proxies (usually five to ten, sometimes unlimited)
Colored mana requirements aside, you need to have three creatures to break even on damage output, though it is worth noting that you dont always want the damage evenly spread out
(To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.) The ability that causes Agent Frank Horrigan to have indestructible starts to apply as soon as it's declared as an attacker
Edicts One of the most straightforward ways to handle an indestructible creature is to make its controller sacrifice it
Time Walk not only goes on this list of rarest cards, its also on my list of cards I wish had flavor text