Mirrodin Besieged

When Kuldotha Flamefiend enters the battlefield, you may sacrifice an artifact. If you do, Kuldotha Flamefiend deals 4 damage divided as you choose...

Exile two target artifacts.

Put a -1/-1 counter on each attacking creature.

At the beginning of your upkeep, you may put a charge counter on target artifact.

{2}{U}, {T}: Put a -1/-1 counter on target creature. You may tap or untap that creature.

When Peace Strider enters the battlefield, you gain 3 life.

Flying

Look at the top five cards of your library. You may reveal any number of creature cards from among them and put the revealed cards into your hand. ...