[legowarrior]

Mammoths are cool, but Mastodons would be a cooler.
Three Spells that come to mind
Summon Mastodon - Earth - A single Mastodon unit (which is sacred for more coolness)
Summon Stampede - Earth/Nature - Summons a Mastodon Bull (Leadership 10 and 1 Holy) and 5 Mastodon in target Territory
Eternal Hunt - Nature/Earth - Global - All pd gets buffed by 1-2 Mastodons.

Okay, I may have gone over board with the Mastodon theme. The take away message is
1) Remote Stampede is cool idea and you should use it,
1) Mastodons > Mammoths
3) Sacred Mastodons would totally Pwn, like an Awesome Possum that Pwns.