Ruby's Sapphire, Future Guide

First strike, Mentor
{u}: look at the top X cards of any player's library,
where X is Sapphire's power.
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 Sapphire dies while fused or while you control
a Ruby, you may place it on top of your library.