You don't need to make another Myr Battlesphere/Wurmcoil Engine each turn to have these be good, although that is certainly something they can do
Treasures are obviously much more versatile than a one-time bump of a black mana, and then theres that whole you win the game clause tacked onto the end
Right, enough waffle, lets look at the prettiness.
2: Choose target creature an opponent controls
Standard Standard is an interesting case
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