Tournament prize cards, staff-exclusive promotional cards, and anniversary editions typically have extremely limited circulation
The way ninjutsu works is that if you have an unblocked attacker on the battlefield, you can bounce it back to your hand to replace it with your ninjutsu card tapped and attacking
These combos can be performed very fast and, more problematically, Lumra can easily go for another win after a foiled attempt
Design Supporter cards with custom effects, Item cards with original text, or Stadium environments from scratch
Your biggest problem will be defending Teval, who has no protection against removal, will suffer when cards are exiled, and who must constantly jump into the fray of battle
Notable Cards: Reprints and $$ Cosmic Intervention Ethereal Valkyrie Hero of Bretagard Ranar the Ever-Watchful Sage of the Beyond Spectral Deluge Stoic Farmer Tales of the Ancestors While not the most amazing thing ever, Spectral Deluge is a 3-mana Cyclonic Rift for creatures, so thats valuable