{G}{U}: This turn, each creature you control enters with an additional +1/+1 counter on it. {G}{U}, Remove a +1/+1 counter from a creature you control: Draw a card.
2013-01-24
Zameck Guildmage's first ability has no effect on creatures already on the battlefield when it resolves.
2013-01-24
Zameck Guildmage's first ability is cumulative. For example, if it resolves twice in a turn, each creature that enters under your control that turn will do so with two +1/+1 additional counters on it.