The Great Wood Aurora

Target creature you control gains Trample,
Aether Strike and becomes a number of colors
equal to the different colored mana used to pay
this spell's mana cost. Sacrifice that creature at
the beginning of the end step. (If that creature
blocks or becomes blocked, it gets +1/+1 for each of its colors until end of turn.)
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A signal to the folk of An-Havva to commence their Festival of the Lights