Special Summon 1 "Stardust Dragon" from your Extra Deck (this is treated as a Synchro Summon), then, immediately after this effect resolves, Synchro Summon 1 Synchro Monster using monsters you control as material
(Its a little strange to me that this card is in the green-black deck, rather than the green-blue deck.) The worst-case scenario here is a recurring [mtg_card]Overrun[/mtg_card], but it shouldnt be tough for a green deck to get a 5/5 or bigger into play[mtg_card]Avenger of Zendikar[/mtg_card], say, or any other large creature that brings its own army along
If no +1/+1 counter is put on it (perhaps because it left the battlefield while its evolve ability was still on the stack), then its last ability doesn't trigger
Breeches, Brazen Plunderer takes this further by letting you steal cards
Rush Duel is a new separate format from the original game with its own unique cards that came out exclusively in Japan in 2020