modular cards mtg UAONO Commander Deck Box, 6-Deck TCG Deck Case with Dice Tray All cards will be carefully packed for safe transit Modern MTG decks —

most likely way to do it I would say is Aetherflux Reservoir so you can can quickly transform and just instagib someone

Archelos, Lagoon Mystic Archelos, Lagoon Mystic is an interesting Sultai creature if you want to get rid of the enters tapped downside on other cards, like tapped lands or ramp spells that put the land onto the battlefield tapped

You can also give them face down cards from your Contraption deck so they can form their own Contraption deck

But in Prince John - Greediest of All discard decks he is much worse, in my opinion, than a card like Daisy Duck - Secret Agent

Go wild, my friend

There is absolutely nothing wrong with good old basic lands, but decks these days have more incentive and ability than ever to play a wide variety of colors off an even wider variety of mana sources