Once you begin to cast a spell with emerge, no player may take actions until youre done
Heck even in modern special-happy deck, normal summon still important for certain combo pieces and often be the last extender you need to survive distruption or big ass space rock) but dont worry not everything about me is a downer: For the first 2 problem (uniqueness and deck building) all we have to do its design the card based on the other decks you and your son enjoy...though im not really gonna stop you to make this direct support to the original gods...which kinda welcome (especially for the 3+2 gods miracle build)
A Sol-land, you could say
While this won't allow you to cheat out too many hard hitters, you should be able to secure some great defenders or creatures that are costly thanks to their abilities
if both are still in your GY, add either that card or this card to your hand, and if you do, place the other on top of your Deck
3) Excadrill was the first Pokmon that I recall getting into competitive and understanding it with