Cassandra Allistan

First Strike, Veteran (If this creature blocks or
becomes blocked and survives combat, put a +1/+1
counter on it during the next end step.)
When Cassandra Allistan attacks alone, you may
tap an untapped creature you control. If you do,
Cassandra gains +X/+0 where X is that creature's
power.
"I serve my Goddess, my love, for all my life. For I
am Her Only."