Mickey, Insurrectionist Defect

When Mickey, Insurrectionist Defect ETBs, you
may sacrifice a Human creature. If you do, you
gain 4 life.
If a spell or effect an opponent controls causes
you to discard this card, put it onto the battlefield
instead of the graveyard.
"It's not that I disagree with you. It's the UNSC
that's the problem."