Wan Shi Tong, All-Knowing and shuffling into multiple libraries

**Describe the bug**
Wan Shi Tong should trigger for each library it shuffles into, but it only triggers once if an effect shuffles multiple cards into multiple libraries

**To Reproduce**
Steps to reproduce the behavior:
1. Have multiple players with cards in graveyard
2. Have Wan Shi Tong, All-Knowing in play
3. Play Mnemonic Nexus
4. Wan Shi Tong will trigger once, for a total of 2 Spirit Tokens

**Expected behavior**
Wan Shi Tong should trigger for each player with cards in their graveyard

**Desktop Version:**
2.0.07-SNAPSHOT-11.18

**Additional context**
Since Wan Shi Tong doesn't have official rulings, here's a [judge's video](https://youtu.be/s7t0dlAyC78?t=449) on this exact interaction