Combine Guildmage does not have summoning sickness.
Mana Needed
({1} magic symbol) ({G} magic symbol) available.
Steps
Activate
Combine Guildmage's first ability by paying ({1} magic symbol) ({G} magic symbol) and tapping it, causing your creatures that enter this turn to enter with a +1/+1 counter on them.
Activate
Bloodthrone Vampire by sacrificing the
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Persist Creature.
When the
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Persist Creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it and at least one +1/+1 counter on it due to
Combine Guildmage.
Remove a -1/-1 counter and a +1/+1 counter from that creature as a state-based action.
Resolve the
Bloodthrone Vampire ability.
Repeat from step 2.
Results
Infinite creature ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinitely large creature until end of turn.
Metadata
In 2 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).