Compact combo core: Heliod, Sun-Crowned + Walking Ballista wins the game on the spot by creating an infinite damage and lifegain loop. Heliod grants lifelink to Walking Ballista, then each time you remove a counter from Ballista to deal 1 damage, Heliod's trigger puts a counter back, letting you repeat forever. The setup: Sol Ring and Esper Sentinel, plus 2 more ramp pieces deploy cheap mana and card draw early. Enlightened Tutor and Idyllic Tutor find your combo pieces or the tutors themselves, while Giada, Font of Hope ramps into your threats. Once Heliod lands (turn 2–3 with acceleration), you tutor Walking Ballista and execute the loop the same turn or next turn, often protected by instant-speed interaction.
Heliod's triggered ability fires whenever you gain life, putting a +1/+1 counter on any creature or enchantment you control — the scaling variable is how many times you gain life in a turn, and each gain triggers once. Walking Ballista enters with X counters (you choose the cost), then its second ability removes a counter to deal 1 damage to any target. When Ballista has lifelink (granted by Heliod's {1}{W} activation), that 1 damage becomes 1 life gain, which triggers Heliod again, replacing the counter you just spent. The loop is deterministic: you pay {1}{W} once, then repeat the Ballista activation for free, dealing infinite damage and gaining infinite life. Enlightened Tutor and Idyllic Tutor find Walking Ballista, Heliod (if not in hand), or tutors themselves, ensuring you assemble the combo by turn 3–4. Land Tax and Ranger-Captain of Eos fetch small creatures (Serra Ascendant, Speaker of the Heavens, Soul Warden) that accelerate into Heliod or protect the combo turn with Ranger-Captain's sacrifice ability (shutting down noncreature spells). Recruiter of the Guard and Ranger-Captain of Eos also tutor creatures with toughness 2 or less, finding Esper Sentinel (which draws cards when opponents cast noncreature spells, taxing their interaction) or other cheap bodies. Well of Lost Dreams converts your lifegain into card draw, letting you dig for combo pieces or protection. Brilliant Restoration is a sole enabler that returns all artifacts and enchantments from your graveyard to the battlefield — if Heliod or Ballista is milled or discarded, Brilliant Restoration rebuilds the combo after a board wipe. Mind Stone and Esper Sentinel provide early card advantage and mana, while Giada, Font of Hope taps for white mana and scales your Angels (Avacyn, Angel of Hope; Sephara, Sky's Blade) into evasive threats that pressure the table while you assemble the combo.