Archelaus, Tarquins Steed

Flash
Soulbound (As long as this creature is soulbound to another creature, both creatures have vigilance, trample, plainswalk, and hexproof).
If Elder Tarquin is on the battlefield when Archelaus, Tarquins Steed dies, destroy Elder Tarquin.
"We ride together, we die together." -Tarquin