Helga does not have summoning sickness and has power 4 or greater.
Steps
Activate
Helga by tapping it, adding at least ({4} magic symbol) that can only be spent to cast creature spells with mana value 4 or greater or creature spells with ({X} magic symbol) in their mana cost.
Cast
Ancestral Statue by paying ({4} magic symbol) .
Helga triggers, causing you to draw a card, gain 1 life and put a +1/+1 counter on
Helga.
When
Ancestral Statue enters the battlefield, it triggers, returning itself from the battlefield to your hand.
Activate
Mind Over Matter by discarding a card, untapping
Helga.
Repeat.
Notes
If you have enough leftover mana to cast the creature, you can instead substitute untapping another permanent instead of
Helga.
Results
Near-infinite mana permanents you control can produce.
Infinite self-discard triggers.
Near-infinite lifegain.
Near-infinite lifegain triggers.
Near-infinite ETB.
Infinite draw triggers.
Infinite looting.
Near-infinite storm count.
Near-infinite LTB.
Near-infinite untap of permanents you control.
Near-infinite +1/+1 counters on
Helga.
Near-infinite 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.
Metadata
In 7 decks according to EDHREC.
Variants of this combo
Below you find all 3 variants of this combo, with the alternative cards highlighted.