When Maul of the Skyclaves enters, attach it to target creature you control. Equipped creature gets +2/+2 and has flying and first strike. Equip {2}{W}{W}
2020-09-25
Attaching an Equipment with its enters-the-battlefield triggered ability isn't the same as using its equip ability. You don't pay mana for the attachment, and if the Equipment enters at a time you couldn't cast a sorcery, you can still attach it to a creature you control.
2020-09-25
If the target creature becomes an illegal target, the Equipment remains on the battlefield unattached.