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If a creature that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, effects that refer to the counters on that creature when it died will see all of those +1/+1 and -1/-1 counters

Ability: Explosive Energy Once during your turn, you may search your deck for up to 5 Basic [G] Energy cards and attach them to your Pokemon in any way you like

He cares about base power/toughness 0/0 creatures hitting opponents and rewards you with new 0/0s with the +1/+1 counters on it equal to the damage they dealt

There's a Beast, if not a Beast Within, for every Commander deck