
First strikeFirst strikeDeals combat damage before creatures without first strike., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking., hastehasteCan attack and use tap abilities the turn it comes under your control.
Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of creatures you control.
When this creature enters, if it's not a token, each opponent creates a token that's a copy of it. The tokens are goaded for the rest of the game. (They attack each combat if able and attack a player other than you if able.)
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.