Arisha, Lavablood Invoker

Trample
Instead of paying the activation cost of a shamans
ability you may instead tap that shaman to use
it's ability, but if you do, that shaman afterwards
loses all it's abilities until your next turn.
If you control no other shamans at the end of
your turn, exile Arisha, then put her back into
play, transformed under your control.
"When the Eldrazi were finally gone, we found new,
more savage ways of gaining back our strength!"
- The Invokers' Tales