MTG Keyword Rules — Comprehensive Rules Glossary

Look up keyword abilities and keyword actions from the Magic: The Gathering Comprehensive Rules

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Proliferate

701.34 Keyword Action
701.34a

To proliferate means to choose any number of permanents and/or players that have a counter, then give each one additional counter of each kind that permanent or player already has.

701.34b

In a Two-Headed Giant game, poison counters are shared by the team. If more than one player on a team is chosen this way, only one of those players can be given an additional poison counter. The player who proliferates chooses which player that is. See rule 810, “Two-Headed Giant Variant.”