You control another creature that has at least one +1/+1 counter on it.
Combine Guildmage does not have summoning sickness.
Mana Needed
available.
Steps
Activate
Combine Guildmage's first ability by paying and tapping it, causing each creature you control to enter the battlefield with a +1/+1 counter on it this turn.
Activate another creature you control that has a +1/+1 counter on it by exiling it, creating a 1/1 Human creature token that enters the battlefield with a +1/+1 counter on it due to
Combine Guildmage.
Repeat step 2 using the Human token instead.
Results
Infinite creature ETB.
Infinite creature LTB.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.