Yamaguchi Tadashi, Service Ace

When Yamaguchi Tadashi, Service Ace enters the
battlefield, return a creature you control to its
owner's hand. When any other creature enters the
battlefield under your control, sacrifice
Yamaguchi Tadashi, Service Ace.
{t}: Deal 1 damage to target player. If this damage
isn't prevented, you may pay {u} to untap
Yamaguchi Tadashi, Service Ace.