I have a custom creature card in my cube. It’s a 0/4 with the text: “Rubblebelt Rioters gets +X/+0, where X is the greatest power among creatures.”
If it’s the only creature in play, it’s a 0/4. If it’s in play with a 1/1, then it’s a 1/4. Easy so far.
What happens if it’s the only creature in play and it has a +1/+1 counter on it? Is it a 1/5? Does it see that the greatest power is 1, so it gives itself +1/+0, then +2/+0, +4/+0 ad infinitum?
I don’t know of any real card with a similar static ability to check the rulings for.
Ah, sadly it’s a redacted cube so I can only take away words from existing cards rather than adding my own. Someone found this problem last time we were playing, so we decided as a group that it probably has infinite power now. Shame there’s no official answer.
Thanks for the input :)