Cast Charismatic Conqueror from your graveyard by paying {1}{W}
Charismatic Conqueror's demonstrate ability triggers, causing you and an opponent to copy it.
Resolve the opponent's copy of Charismatic Conqueror, and then resolve your copy of Charismatic Conqueror.
When your Charismatic Conqueror token enters the battlefield,  the opponent's Charismatic Conqueror triggers, causing you to tap your Charismatic Conqueror token.
Resolve the original Charismatic Conqueror spell.
When the nontoken Charismatic Conqueror enters the battlefield, the opponent's Charismatic Conqueror triggers, causing you to not tap the nontoken Charismatic Conqueror, and causing the opponent to create a 1/1 Vampire creature token.
When the opponent's Vampire token enters the battlefield, both Charismatic Conquerors you control trigger, causing you to create at least one 1/1 Vampire creature token.
When your Vampire token enters the battlefield, the opponent's Charismatic Conqueror triggers, causing you to not tap the Vampire token, and causing the opponent to create a 1/1 Vampire creature token.
Repeat from step 7.

Infinite creature ETB

Infinite creature tokens

Infinite creature ETB for target opponent

Infinite creature tokens for target opponent

Charismatic Conqueror

The Twelfth Doctor

Serra Paragon

Activate Dire Mimic's first ability by tapping and sacrificing it, adding one mana of any color.
Cast Dire Mimic from your graveyard using Serra Paragon's ability by paying {0}.
Displacer Kitten triggers, blinking Serra Paragon.
Activate Dire Mimic's first ability by tapping and sacrificing it, adding one mana of any color.
Dire Mimic leaves the battlefield, triggering its ability.
In response, repeat from step 2.
Once you have infinite mana, resolve all Dire Mimic abilities, causing you to exile it from your graveyard if it's in your graveyard and gain infinite life.

Infinite colored mana

Infinite lifegain

Infinite lifegain triggers

Infinite creature LTB

Infinite storm count

Displacer Kitten

Dire Mimic

Sage of the Beyond

Ugin, the Ineffable

Infinite death triggers

Infinite creature sacrifice triggers

Semblance Anvil

Cast Necromancy from your graveyard by paying {2}{B} using Serra Paragon's ability.
Displacer Kitten triggers, blinking Serra Paragon.
Necromancy triggers, returning Composite Golem to the battlefield and becoming an aura attached to it.
Activate Composite Golem's ability to add {W}{U}{B}{R}{G}.
Necromancy goes to the graveyard as a state-based action.
Its ability granted by Serra Paragon triggers.
In response, repeat.
After repeating any number of times, resolve all triggered abilities, gaining 2 life each time.

Combos with "Serra Paragon"