Bestow

Bestow is a keyword ability introduced in Theros, intended for both enchant source and creature permanence.

A creature with bestow gives you the option to cast it as an Aura that enchants a creature, granting the enchanted creature the power, toughness, and abilities of the creature with bestow. Bestow is also featured in the rest of the Theros block.

The design idea of Bestow is that a type of Aura that endures a little more past removal, not only powering up your creatures but remaining in play.

From the Comprehensive Rules (November 8, 2024—Edge of Eternities)

• 702.103. Bestow
  • 702.103a Bestow represents a static ability that functions in any zone from which you could play the card it’s on. “Bestow [cost]” means “As you cast this spell, you may choose to cast it bestowed. If you do, you pay [cost] rather than its mana cost.” Casting a spell using its bestow ability follows the rules for paying alternative costs (see 601.2b and 601.2f–h).
  • 702.103b As a spell cast bestowed is put onto the stack, it becomes an Aura enchantment and gains enchant creature. It is a bestowed Aura spell, and the permanent it becomes as it resolves will be a bestowed Aura. These effects last until the spell or the permanent it becomes ceases to be bestowed (see rules 702.103e–g). Because the spell is an Aura spell, its controller must choose a legal target for that spell as defined by its enchant creature ability and rule 601.2c. See also rule 303.4.
  • 702.103c If a bestowed Aura spell is copied, the copy is also a bestowed Aura spell. Any rule that refers to a spell cast bestowed applies to the copy as well.
  • 702.103d When casting a spell bestowed, only its characteristics as modified by the bestow ability are evaluated to determine if it can be cast.
    

    Example: Aether Storm is an enchantment with the ability “Creature spells can’t be cast.” This effect doesn’t stop a creature card with bestow from being cast bestowed.

    Example: Garruk’s Horde says, in part, “You may cast creature spells from the top of your library.” If you control Garruk’s Horde and the top card of your library is a creature card with bestow, you can cast it as a creature spell, but you can’t cast it bestowed.

  • 702.103e As a bestowed Aura spell begins resolving, if its target is illegal, it ceases to be bestowed and the effect making it an Aura spell ends. It continues resolving as a creature spell. See rule 608.3b.
  • 702.103f If a bestowed Aura becomes unattached, it ceases to be bestowed. If a bestowed Aura is attached to an illegal object or player, it becomes unattached and ceases to be bestowed. This is an exception to rule 704.5m.
  • 702.103g If a bestowed Aura phases in unattached, it ceases to be bestowed. See rule 702.26, “Phasing.”