Summoning Sickeness

[(nameless one)]

Call me a noob but at what exact phase does a creature lose its summoning sickness? Is it during the untap phase or upkeep?

More questions will be coming after this.

Thanks!

[luma]

A creature has "summoning sickness" if you haven't controlled it continuously since the beginning of your most recent turn. Your turn begins when you untap, so that's when a creature is no longer "summoning sick".

[(nameless one)]

Awesome!

Now, the question follow question:

If I flashed in a creature or put it on the field via Vial before I untap my permanent, does it still get summoning sickness.

Can I actually do that or I'd have to do those at the end of my opponent's turn?

[sunshine]

Players do not receive priority during the untap step (meaning no Vial action). You would have to Vial your creatures in at the end of your opponents turn, or earlier of course, if you want them to not be sick on yours.

Comprehensive Rules -
502.3. No player receives priority during the untap step, so no spells can be cast or resolve and no abilities can be activated or resolve. Any ability that triggers during this step will be held until the next time a player would receive priority, which is usually during the upkeep step. (See rule 503, "Upkeep Step.")