Amaji, the Faceless

When Amaji enters the battlefield, each player sacrifices a number of creatures equal to the
amount of mana spent to cast him.
Defender, Shroud (This creature can't attack, nor
can it be the target of spells or abilities)
{w}{b}{g}: You may cast artifacts and creatures in
your opponents' graveyards this turn, spending
mana as if it were mana of any color to do so.
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"Hush, Amaji. This is all in the Kodamas'
best interest."