Summon Shardblade

Heartbeat: You may cast this spell into exile for {1}. If you do, put ten heartbeat counters on it.
Remove one at the end of each phase. Once all
have been removed, put Summon Shardblade onto
the battlefield equipped to a target creature.
Equipped creature gets +3/0 and cannot activate
Nahel Bonds. If equipped creature deals combat
damage to another creature, put two -1/-1
counters on it.
(This card cannot be equipped to a creature with
an active Nahel Bond.)