621, Chained Hound

When 621, Chained Hound enters the battlefield, you may attach any number of Equipment you control to it without paying their equip costs.

If you attach two or more Equipment this way and their total mana value is 6 or greater, transform 621, Chained Hound.

{8}{b/r}{b/r} Transform 621, Chained Hound. Activate only as a Sorcery