#precombat main phase

[magicjudge]

Hi! If I play Blinkmoth Urn on my turn, will I be able to get the mana or would I need to wait for my next turn to take advantage of it?

You’ll need to wait until your next turn unless you’re casting it with flash during your upkeep or draw step. Once your precombat main phase has begun, it’s too late for a newly-arrived Blinkmoth Urn to trigger and you can only ever have one precombat main phase in a turn.