If you're really into dragons, check out our collection of decks here, including one for EDH
For this card's Xyz Summon, you can treat Forbidden One monsters as Level 10 monsters for material
21.3 The Buyer shall pay all reasonable legal and other costs reasonably incurred by the Company or the Seller (whether or not Court proceedings shall have been issued) as a result of the Buyer's non-payment for and/or failure to collect a Lot, on a full indemnity basis, together with interest thereon at the rate specified in clause 21.1(c) from the date upon which the Buyer shall have become liable to pay costs
Sol Ring Look, we all know what Sol ring is and does
The reason this happens is because cards don't retain any knowledge of their past when exiled, and so default back to the untransformed state when they re-enter the battlefield.
Needing to have one Hedron Alignment in your hand, one on the battlefield, and one in exile and your graveyard, this is an incredibly difficult win to assemble