Change the Game: Uno

If at any given time a player has one card in
their hand they must call out "Uno" before the current turn ends or before the card is played.
If they do not, exile their card. Players can only cast spells that share a color or casting cost with the spell most recently cast. Whenever a player
plays a land, they must choose one:
- The next player skips their turn.
- The order of play is reversed.
- Draw two cards.
- Target opponent draws four cards.