
HasteHasteCan attack and use tap abilities the turn it comes under your control.
ProwessProwessWhenever you cast a noncreature spell, this creature gets +1/+1 until end of turn. (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
ValiantValiantAbility word: triggers the first time each turn this creature becomes the target of a spell or ability you control. — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, exile the top card of your library. Until end of turn, you may play that card.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.