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TrampleTrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
Whenever you cast an artifact spell with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing 
has mana value 4. X counts as 0 except on the stack. 4 or greater, put a +1/+1 counter on each creature you control.
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.
