Five-Color Counter Cauldron

A Standard-legal five-color midrange deck that grows an army of +1/+1 counters with Bristly Bill, Spine Sower and Mossborn Hydra, then reuses key creatures through Agatha's Soul Cauldron before closing with Elenda, Saint of Dusk or Moonshaker Cavalry.

• Bristly Bill, Spine Sower and Mossborn Hydra trigger on every landfall, putting +1/+1 counters on creatures, so each fetch (Fabled Passage, Terramorphic Expanse) and each basic fetched becomes two triggers.
• Warden of the Inner Sky grows into a flying, vigilant, indestructible threat once it has three or more +1/+1 counters, and it can tap creatures to keep adding counters.
• Agatha's Soul Cauldron exiles a creature from your graveyard and grants its abilities to every creature you control with a +1/+1 counter — for example giving your whole team lifelink off Elenda, Saint of Dusk or flying off Moonshaker Cavalry.
• Elenda, Saint of Dusk is a flying lifelinker that leaves behind a token army when she dies, and Moonshaker Cavalry turns your already-large board into a lethal flying alpha strike.
• Selfless Spirit sacrifices itself to give your whole board indestructible, protecting your counters from board wipes.

Keep hands with 2-4 lands, at least one turn-one or turn-two play (Warden of the Inner Sky, Bristly Bill, Spine Sower, Opt, Shock), and preferably a landfall enabler. Mulligan any hand with fewer than two lands, no cheap creature, or only five-plus-drops. A hand with Warden turn one, a fetchland, and a removal spell is ideal.

Early: Deploy Warden of the Inner Sky or Bristly Bill, Spine Sower, crack fetchlands to trigger landfall twice, and use Opt and Shock to smooth draws and answer small threats. Mid: Ramp with extra land drops and Terramorphic Expanse, then go wide with Mossborn Hydra and Ajani, Outland Chaperone while using Bitter Triumph, Get Lost, Shoot the Sheriff, and Lightning Strike to remove key opposing permanents. Deploy Agatha's Soul Cauldron to weaponize your graveyard. Late: Overrun the board with counter-laden creatures, cast Elenda, Saint of Dusk for a resilient threat, and finish with Moonshaker Cavalry granting the team flying for lethal. Keep Selfless Spirit in reserve against sweepers.

Fast aggro decks that race before your mana develops, and heavy blue control with lots of counterspells can disrupt your key threats. Graveyard hate like Rest in Peace or Ghost Vacuum turns off Agatha's Soul Cauldron. Because the mana base leans on fetch lands and basics, you can stumble on colors, so land destruction and fast combo can punish a slow start.