Yes, these Japanese variants are legal in any format where the cards are legal
Set Name: Seventh Edition
Sure, you have to return a land to your hand every turn, but thats also powerful in its own way
Doctor Doom allows Connive to benefit you no matter the outcome: when you discard a land card, each opponent takes 2 damage, and if it's a nonland card, you still place a +1/+1 counter on the creature that Connived
Najeela, the Blade-Blossom If you develop ways to get tons of mana in all colors, then Najeela, the Blade-Blossom can be both one of the strongest 5-color commanders and best aggro commanders in the game For , you give your creatures a ton of useful keywords haste, trample, and lifelink and an additional combat phase
I use Questing Phelddagrif the same as Phelddagrif, get it in play, then dump all the mana I have into giving out goodies, making sure to give out what is needed