Source: TwicebakedJake/YouTube
The gimmick behind them is that they can be played with life instead of mana, a strategy that allows for some immensely broken combos due to all the mana-hoarding one could do
Hmmm, white card draw/tax effect

Ao, the Dawn Sky Atsushi, the Blazing Sky Boseiju, Who Endures Eater of Virtue Eiganjo, Seat of the Empire Go-Shintai of Ancient Wars Go-Shintai of Boundless Vigor Go-Shintai of Hidden Cruelty Go-Shintai of Lost Wisdom Go-Shintai of Shared Purpose Goro-Goro, Disciple of Ryusei Greasefang, Okiba Boss Heiko Yamazaki, the General Hidetsugu, Devouring Chaos Hinata, Dawn-Crowned Isshin, Two Heavens as One Jin-Gitaxias, Progress Tyrant Junji, the Midnight Sky Kairi, the Swirling Sky Kaito Shizuki Kodama of the West Tree Kotose, the Silent Spider Kura, the Boundless Sky Kyodai, Soul of Kamigawa Light-Paws, Emperor's Voice Naomi, Pillar of Order Nashi, Moon Sage's Scion Norika Yamazaki, the Poet Otawara, Soaring City Raiyuu, Storm's Edge Risona, Asari Commander Satoru Umezawa Satsuki, the Living Lore Shigeki, Jukai Visionary Sokenzan, Crucible of Defiance Takenuma, Abandoned Mire Tameshi, Reality Architect Tamiyo, Compleated Sage Tatsunari, Toad Rider Tezzeret, Betrayer of Flesh The Reality Chip The Wandering Emperor

The last player to take the initiative keeps it until the initiative changes again