When a Siege is defeated, it is exiled, and its owner gets to play the reverse side (which could be a Creature, Artifact, or some other MTG card type) for free at Instant speed.
The Avatar horror has seen play mostly within the MTG Commander format
You can go down the route of Sigarda's AidSigarda's Aid or Hammer of NazahnHammer of Nazahn which allow you to attach Equipment for free when you play them but I personally prefer the flexibility of being able to equip whenever I want
With Bring To Light, you search your library for a creature, instant, or sorcery with a mana value equal to or less than the total number of colors of mana you spend to cast this spell
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