Can you basically get a two for with any ETB effects that target creatures if you flicker the one entering? Also can you cheat in a permant soulbond by flickering a soulbond creature entering and targeting a new creature? If so then this opens a whole new bag of tricks.
If you flicker the creature, it is already on the battlefield, not entering. If you mean, for an example:
{catharsis crusade} on the bf, you play a creature and {flicker} it - then the creature will be a totally new object the next time it enters, and will have only 1 counter. All other creatures will have 2 counters.
And yes, you can flicker a creature to break a soulbond