Rhinostodon

Trample
You may cast Rhinostodon from your graveyard
if it has one or more creature cards above it.
When you do, it costs {1} less to cast for each
creature card above it.
Rhinos you control with base power less than 5
have base power 5.
The modern day Rhox trace their lineage back to this
majestic ancestral rhino.