Duration Rule

[Arcanes]

Hi hi... i was looking in forum for this detail, but i dont find it.

Exactly, In what moment from my turn the Duration Counter (in support abilities) change?
Have some priority vs the other effects like poison, trigger abilities form other cards like artifacts, etc?

RELATED SUGGESTION: The game should have a indicator for this count...

That is all.

[Gondorian]

The Duration counter on a Support Ability ticks down at the start of its controller's turn.

So ...

A card with Duration of 1 is destroyed at the start of your next turn after you summoned it.
A card with Duration of 2 lasts one extra of your turns.

I agree there should be a duration counter.

Timing-wise, negative effects do their thing before any other start of turn effects. So Grave Resistance would prevent 1 damage from poison to your Undead ally before it gets destroyed, for example. (Just tested to confirm. )