Agatha's Soul Cauldron + Inquisitive Puppet + First Day of Class
Agatha's Soul Cauldron
Inquisitive Puppet
First Day of Class
Requires
Agatha's Soul Cauldron must be on the battlefield.
Inquisitive Puppet must be in exile (exiled by Agatha's Soul Cauldron).
First Day of Class must be in hand.
Mana needed: 
Steps
- Cast First Day of Class by paying .
- Activate another creature you control that has a +1/+1 counter on it by exiling it, creating a 1/1 Human creature token.
- When the Human enters the battlefield, First Day of Class triggers, putting a +1/+1 counter on it.
- Repeat from step 2 using the Human token instead.
Results
Infinite ETB. Infinite LTB.
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