Haxorus

May cast as a 2/1 stage 1 creature with first
strike for a prevolve cost of {3}
May cast as a 5/3 stage 2 creature with
first strike for a prevolve cost of {4}{r/g}
You may pay {r/g}{r/g}{r/g}{r/g} to evolve to the next stage
Double Strike, Trample, Stage 3 Creature