Lunar Avenger

Sunburst (This enters with a +1/+1 counter on it for each color of mana spent to cast it.)
Remove a +1/+1 counter from this creature: This creature gains your choice of flying, first strike, or haste until end of turn.

The List

Fifth Dawn

Sunburst (This comes into play with a +1/+1 counter on it for each color of mana used to pay its cost.)
Remove a +1/+1 counter from Lunar Avenger: Lunar Avenger gains your choice of flying, first strike, or haste until end of turn.

You choose whether Lunar Avenger gains flying, first strike, or haste when the activated ability resolves.