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For example, a 4/4 creature with trample blocked by a 4/4 creature with 2 damage marked on it may assign 2 damage to that creature and 2 damage to the defending player
If you do, target player loses 2 life and you gain 2 life
While the deck isnt absolutely packed with giant creatures so you can place those -1/-1 counters more freely, many of the creatures present are buffed or gain additional effects by this counter placement
Having trample means it pushes through a bit of damage before dying to something much smaller