Fantastic card. Great tribute fodder for pretty much anything you want to tribute. Use it with econ to tribute summon a monster and remove your opponent's monster in one go! Use order to charge on it. Having an easy special summon that works in any deck (that isn't a meta deck like red eyes) is vital. If you don't want to use meta decks you should put two in your deck. It can easily boost your win ratio.
I was having all kinds of trouble because my deck just wasn't capable of putting two monsters on the field in a turn. Decided to put two of these in and went on an instant win streak.
Yeah, not worth anyway. If it is for a mission, play with a friend and tell him/her to use Embodiment of Apophis, use Exchange card (from Joey drop) or use a card to get EoA out of the graveyard.
Most players underestimate this card quite a bit.
It has a good def, can be summoned instantly like a trap and is great for tribute fodder.
And it also has a good synergy with storm which is an awesome card.
Get it in Card Trader. Or use Pot of Benevolence to bring it back from the grave, with Temple of the Kings activated if you happen to have it as the bottom card in your deck, and destroy it with Twister or something, and recover it again from grave with another Pot of Benevolence. Or have an agreement to Duel someone with 2 Apophis in their deck and use Exchange spell card to take theirs.