GrimGrim is unable to Sacrifice Zombie Tokens to Untap

GrimGrim is unable to Sacrifice Zombie Tokens to Untap in multiplayer

**Expected behavior**
GrimGrim should untap and get +1/+1

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Version [e.g. 22]

**Additional context**
Even on an empty board with just grimgrim and a token, he cannot untap with his ability.

Start by locating GrimGrim's card definition and reproduce the issue in a multiplayer game with GrimGrim and a Zombie token on an otherwise empty board. Trace the sacrifice-and-untap ability and verify that activating it causes GrimGrim to untap and receive +1/+1.

Written by the indexing model from the issue text.