Flying (This creature can't be blocked except by creatures with flying or reach.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
The sacred feathers of the pegasus are said to have healing powers.
Trample
Tribute 3 (As this creature enters the battlefield, an opponent of your choice may put three +1/+1 counters on it.)
When Thunder Brute enters the battlefield, if tribute wasn't paid, it gains haste until end of turn.