devtrackers.gg
This one was !FUN!. Consider Opalescence and TTT any other enchantment. It's not a creature until it's on the battlefield- which means it enters as a creature. However, by the time it's on the battlefield (which is when it's a creature), it's too late for it to enter with a +1/+1 counter on it. Because, you know, Winding Constrictor.
In the end, the AI is basically like: "Yeeeaaah, I think I know what you're looking for." and just makes something up.
#wotcstaff