If multiple Heimerdingers are in play, do they grant abilities to each other, and can this create an infinite loop?

Ruling: Multiple Heimerdingers would each gain copies of the same abilities from other sources (like each other and other cards), but this doesn't affect gameplay because when you exhaust a Heimerdinger, you can only activate one ability at a time, not all of them simultaneously.

Sequence:

• Each Heimerdinger gains abilities from other cards in play (like Ravenborn Tome)
• Each Heimerdinger also gains abilities from other Heimerdingers
• When you exhaust a Heimerdinger, you choose only one of its abilities to activate
• Having the same ability multiple times has no gameplay impact since you only activate one

Nuances:

• Even if Heimerdingers theoretically create an infinite loop of copying each other's abilities, it doesn't matter because you can only select and activate one ability when exhausting
• Having the same ability once, twice, or infinitely makes no difference to actual gameplay