I just had an enemy team use World Rupture on me and I immediately realized something: two of the main counters to countdown tiles are completely unavailable! There’s no owner to stun to slow them down (team stun probably works I haven’t been able to verify this yet) and no owner to try to kill to remove them before they go off.
I’m not sure what the right solution is here. Some or all countdown-generating TU powers could be removed from the pool, the countdown tiles could be associated (preferably in an obvious way) to a specific enemy, TU countdowns could have timers increased, or it could just be declared “working as intended, countdown TU powers are pretty great”.