If this has happened once already in a turn, you can double the number of +1/+1 counters on that creature
The Charizard card pictured above is numbered 39/165, meaning it's the 39th card in a set of 165 total cards made
Commanding Conclusion Munda, Ambush Leader | Illustration by Johannes Voss Avatar: The Last Airbender finally puts allies on the map in a meaningful way, though it doesnt actually offer too many new commanders in the allies-matter space
The rest are far too conditional, and often underwhelming
This obviously fits best in multicolor dragon Commander decks like Tiamat and Ur-Dragon (both these cards are spiking in price right now by the way thanks to all the new dragon toys)
Some multicolor cards, like transform cards with color indicators or hybrid mana spells, dont use a gold frame but are still multicolored by the rules