Eidolon of Countless Battles

Public decks that run Eidolon of Countless Battles

• Silverquill Influence - Secrets of Strixhaven, led by Killian, Decisive Mentor
• Virtue and Valor - Wilds of Eldraine Commander, led by Ellivere of the Wild Court

Commanders that run Eidolon of Countless Battles most

Deck counts from EDHREC.

• Killian, Decisive Mentor: 7,456 decks
• Eriette of the Charmed Apple: 4,279 decks
• Light-Paws, Emperor's Voice: 4,149 decks
• Ellivere of the Wild Court: 3,766 decks
• Three Dog, Galaxy News DJ: 2,066 decks
• Arna Kennerüd, Skycaptain: 1,665 decks
• Pearl-Ear, Imperial Advisor: 1,478 decks
• Killian, Ink Duelist: 1,454 decks

Often played with Eidolon of Countless Battles

Cards that show up in the same decks on EDHREC.

• Galvanic Arc
• Bravado
• Iroas's Blessing
• Nimbus Naiad
• Flitterstep Eidolon
• Knickknack Ouphe
• Rune of Speed
• Etali's Favor
• Timber Paladin
• Thassa's Emissary

Rulings

• 2013-09-15: Unlike other Auras, an Aura with bestow isn't put into its owner's graveyard if it becomes unattached. Rather, the effect making it an Aura ends, it loses enchant creature, and it remains on the battlefield as an enchantment creature. It can attack (and its {T} abilities can be activated, if it has any) on the turn it becomes unattached if it's been under your control continuously, even as an Aura, since your most recent turn began.
• 2013-09-15: Unlike other Aura spells, an Aura spell with bestow isn't countered if its target is illegal as it begins to resolve. Rather, the effect making it an Aura spell ends, it loses enchant creature, it returns to being an enchantment creature spell, and it resolves and enters the battlefield as an enchantment creature.
• 2013-09-15: Auras attached to a creature don't become tapped when the creature becomes tapped. Except in some rare cases, an Aura with bestow remains untapped when it becomes unattached and becomes a creature.
• 2013-09-15: If a permanent with bestow enters the battlefield by any method other than being cast, it will be an enchantment creature. You can't choose to pay the bestow cost and have it become an Aura.
• 2013-09-15: On the stack, a spell with bestow is either a creature spell or an Aura spell. It's never both, although it's an enchantment spell in either case.
• 2014-02-01: A permanent with bestow is either a creature or an Aura, not both (although it's an enchantment either way). It will contribute just +1/+1 toward the bonus given by Eidolon of Countless Battles.
• 2014-02-01: Eidolon of Countless Battles's last ability functions only on the battlefield. In other zones, it is a 0/0 enchantment creature card.