This is a easy-to-build Rend Blackhand deck that can easily handle most PvE content in Warcraft Rumble.
Drake: Drake is awesome alongside Rend. Great splash and damage.
Earth Elemental: Solid siege unit to handle towers and tank.
Harpies: Crazy high damage, fast unit.
Gryphon: Solid cycle unit with high damage and great range.
Quilboar: Great tank, damage soaker, and chest opener.
S.A.F.E. Pilot: Solid AoE and good counter against squishy units and grouped up enemies.