At 
it's just too expensive.
Moreover, consider that if you want to attack with this creature you have to invest most of your mana, and so you can't play other spells that turn...
Posted By:
Paolino
(1/19/2012 6:15:35 AM)
Combine it with Cauldron of Souls and other ways of giving it Persist and it becomes very persistent indeed! Also great to combine with Harbinger of Night, Midnight Banshee and Soul Snuffers.
Posted By:
Tiggurix
(5/27/2012 7:58:55 PM)
You shouldn't ever be using it, no, but... Spike Cannibal gives you a nice reset button, I guess.
You could also just go all out, stacking Corpsejack Menaces and Doubling Seasons before unleashing with a timely Fling or Dismantle (onto Darksteel Reactor? I dunno.)
Posted By:
Kirbster
(11/1/2012 10:25:46 PM)
I guess this prototype was a failure.
Posted By:
Villainous1
(2/6/2013 11:05:15 AM)
Good idea, bad card.
Even as a 2/2 for three mana, it wouldn't be good. For five mana... bah. They should have given it some additional ability, such as.. "when Myr Prototype dies, it deals X damage to each creature and player, where X is the number of counters on it".
Posted By:
majinara
(3/22/2013 5:29:01 AM)
@Test-Subject_217601
Nope.
Braid of Fire gives you mana during your upkeep. Myr Prototype requires the mana during the declare attackers step. It's long gone by then (remember, mana pools empty and the end of steps and phases.)
Posted By:
AeroSigma
(4/1/2014 5:27:26 PM)