Kuja, Genome Sorcerer / Trance Kuja, Fate Defied Kuja, Genome Sorcerer starts slow by making wizard tokens that deal chip damage whenever you cast noncreature spells, but once you control four wizards (token or otherwise), it transforms into Trance Kuja, Fate Defied, which doubles all damage your wizards deal
The only thing is the tap is lava
Rarity might warp your design, but generally speaking, stick to mythic planeswalkers unless you specifically want your planeswalker at a lower rarity
Final Fantasy is good
Once this ability gets going the Dragons you create can easily snowball into more Dragons, and from there a victory
TERRA, MAGICAL ADEPT // ESPER TERRA There are a lot of five color Commanders that are suitable to jam all of your summons into