Steelhide Rhino

Hexproof
Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
"When recourses for weapons run low, we have
to resort to hunting the rhinos. The only problem,
however, it that its hide it as tough as our weapons..."
-Eswild, Adsgrove Recruiter