Sapphire's Ruby,Fierce Defense

Haste, Vigilance
Forever Fusion {3}{t} (this card becomes an
Aura and enchants target creature, which adds
this card's power, toughness, and all of this card's
abilities except Fusion. For the rest of the game,
this card can only fuse with creatures with that
name.)
If Ruby dies while fused or while you control
a Sapphire, you may place it on top of your
library.