Finn Sword

Equipped creature gets +4/+3 and lifelink
{6} - Sacrifice Finn Sword and search your library
for a card called "Blue Catalyst Comet" and
put it into your hand.
Merge {4} (If you have a card named "Grass Sword"
on the battlefield you can sacrifice both Finn Sword
and Grass Sword. Search your library for a card
named "Fern" and put it into your hand.)