Najeela, the Blade-Blossom | Brudiclad, Telchor Engineer | There and Back Again

Cards

At the beginning of your precombat main phase,
There and Back Again triggers, creating a legendary 6/6 Smaug creature token, and causing you to sacrifice
There and Back Again.
At the beginning of your combat phase,
Brudiclad triggers, creating a 2/1 Phyrexian Myr artifact creature token, then causing all tokens you control to become copies of the Smaug token.
Put all but one Smaug token into your graveyard due to the legend rule.
When the Myr dies, it triggers, creating fourteen Treasure tokens.
Activate five Treasures by tapping and sacrificing them, adding ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) .
Activate
Najeela by paying ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) ({G} magic symbol) , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat from step 2 each combat phase.