Srenna, Chosen Wielder

Vigilance.
Whenever Srenna, Chosen Weilder attacks, you
may sacrifice an equipment card you control that
is equipped to it. If you do, search your library
for an equipment card and put it onto the
battlefield equipped to Srenna, then shuffle.
"Oh this? Stole it from one of those traveling merchants
a while back. Not sure why it starts glowing whenever
I touch it though."