An Aura put onto the battlefield this way can enchant an artifact, land, or creature that was already put onto the battlefield, but can't enchant an enchantment that's being put onto the battlefield at the same time as it
Check out the transforming Gwen Stacy/Ghost-Spider card
Here's one process that may help
For the most part, if your deck competes with a preconstructed deck out of the box, but does not overpower it, chances are that your deck is a Tier 2 deck
If you have two on the battlefield, they'll each grant the other one shroud
Grumgullys ability nullifies this due to the +1/+1 counter it gives, which means all you need is a sac outlet for infinites