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Its a relatively small mechanic in terms of the great expanse that is Magic mechanics

The deck then adds a ton of different wrath effects (Star of Extinction, Razia, Austere Command, Blasphemous Act, Day of Judgment, etc) to deal with any threats your opponents might be able to cast prior to you repeatedly wiping the board of lands

The value proposition is unbeatable when boxes are out of reach

Whenever another permanent you control is put into a graveyard from the battlefield, if it had one or more counters on it, you may put that number of +1/+1 counters on target creature.

the full explanation is in our One Piece TCG keywords guide