OCG Rulings

• "The Atmosphere" is a Special Summon monster.^[1]

• The effect of "The Atmosphere" which equips a monster to it is an Ignition Effect.^[1]

• The effect of "The Atmosphere" targets the one face-up monster on your opponent's side of the field which will be equipped to this card as an Equip Card.^[1]
• You can Special Summon "The Atmosphere" by removing from play a Token Monster, such as a "Sheep Token".^[2]

References

1. ↑ ^{1.0 1.1 1.2} Konami FAQ: Effect Monster > The Atmosphere
2. ↑ Konami FAQ: Can a Token Monster be used when Special Summoning a monster like "The Atmosphere" or "Red-Eyes Darkness Metal Dragon"?