Shadowmere, Spectral Steed

Indestructible, Trample
When Shadowmere enters the battlefield,
Choose a creature you control. That creature
has trample for as long as you control
Shadowmere. If the chosen creature dies,
exile Shadowmere.
"Why don't you hold onto Shadowmere
a while longer? He's a fine steed, and hasn't
been ridden nearly as much as he should
lately." -Astrid