You'll just stop being a card and the game will continue
The general consensus seems to be that the set is jammed packed full of Commander cards, leading some to dub the set "Commander Horizons", but I think it's hard to fully grasp the impact of these cards without seeing any tournament results with these in the environment
Manufacturer: Magic: The Gathering
Each card of the meld pair represents a specific card on its front-face and half of a combined/melded, oversized back-face
It has power and toughness equal to the number of Forests you control, so early in the game its not very helpful, but in long games, pulling out your Leige on turn 18 with a straight green deck could be a steal
Callaphe, Beloved of the Sea as a Voltron commander is really fun to play