Helga, Skittish Seer + Chakram Retriever + Sparkcaster Combo

Sparkcaster in hand.

Helga and Chakram Retriever on the battlefield.

Helga has power 4 or greater and does not have summoning sickness.

available

Activate Helga by tapping it, adding at least or that can only be spent to cast creature spell with mana value 4 or greater or with in their mana cost.

Cast Sparkcaster by paying its mana cost.

Helga and Chakram Retriever trigger.

Resolve the Helga trigger, causing you to draw a card, gain 1 life, and put a +1/+1 counter on Helga.

Resolve the Chakram Retriever trigger, causing you to untap Helga.

When Sparkcaster enters the battlefield, it triggers twice.

Resolve the first trigger, returning Sparkcaster from the battlefield to your hand.

Resolve the second trigger, dealing 1 damage to any target.

Repeat.

Significant damage

Infinite card draw

Significant lifegain

Significant lifegain triggers

Significant creature ETB

Infinite draw triggers

Significant storm count

Significant creature LTB

Significant +1/+1 counters on a creature

Significant colored mana that can only be spent to cast creature spells with mana value 4 or greater or creature spells with X in their mana cost