Draw a card.
Lyla triggers, putting a +1/+1 counter on Pensive Professor.
Pensive Professor triggers, causing you to draw a card.
Repeat from step 2.

Infinite card draw

Infinite draw triggers

Near-infinite +1/+1 counters on a creature

Pensive Professor

Lyla, Holographic Assistant

Draw a card.
Wizard Class triggers, putting a +1/+1 counter on Pensive Professor.
Pensive Professor triggers, causing you to draw a card.
Repeat from step 2.

Wizard Class

Activate Pensive Professor using Psychic Frog's ability by discarding a card, putting a +1/+1 counter on Pensive Professor.
Pensive Professor triggers, causing you to draw a card.
Repeat.

Infinite rummaging

Infinite self-discard triggers

Psychic Frog

Agatha's Soul Cauldron

Cast Artificial Evolution by paying its mana cost, changing all instances of either "Merfolk" or "Knight" on Vodalian Wave-Knight to either "Human" or "Wizard".
Draw a card.
Vodalian Wave-Knight triggers, putting a +1/+1 counter on Pensive Professor.
Pensive Professor triggers, causing you to draw a card.
Repeat from step 3.

Near-infinite +1/+1 counters on certain creatures

Vodalian Wave-Knight

Artificial Evolution

Activate Unnatural Selection by paying {1}, causing Pensive Professor to become a Merfolk or Knight until end of turn.
Draw a card.
Vodalian Wave-Knight triggers, putting a +1/+1 counter on Pensive Professor.
Pensive Professor triggers, causing you to draw a card.
Repeat from step 3.

Combos with "Pensive Professor"