Rinaldo, King's Slanderer

When Rinaldo, King's Slanderer enters the
battlefield, put a +1/+1 counter on each other
Rebel creature you control.
Whenever Rinaldo, King's Slanderer attacks
alone, it gains trample until end of turn.
At the end of combat, if Rinaldo, King's
Slanderer attacked alone this combat,
sacrifice it.