
MenaceMenaceCan't be blocked except by two or more creatures., hastehasteCan attack and use tap abilities the turn it comes under your control.
BoastBoastActivate only if this creature attacked this turn and only once each turn. — Sacrifice another creature or artifact: This creature deals damage equal to 2 plus the sacrificed permanent's mana valuemana valueActivate only if this creature attacked this turn and only once each turn. to any target. (Activate only if this creature attacked this turn and only once each turn.)
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.