
Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, proliferateproliferateChoose any number of permanents and/or players, then give each another counter of each kind already there.. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
When this creature diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., it deals damage equal to its power to any target.
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.