17 Apr 2020
You may choose to move zero counters.
17 Apr 2020
You choose which counters to move as Slippery Bogbonder's triggered ability resolves.
17 Apr 2020
You can't move counters from the target creature to itself.
17 Apr 2020
You may move counters from any number of other creatures you control, not just from one.
17 Apr 2020
If Slippery Bogbonder's triggered ability puts a hexproof counter on a creature an opponent controls, you can still move counters onto that creature.