Pay 2 Mana to attach Captain's Riverboat to a target creature. That creature gains Islandwalk. If the kicker was payed then all creatures of the same type as the target gain Islandwalk as long as Captain's Riverboat remains in play.
Flavor Text: Anyone can Captain a boat, but only the most experienced of Captains can earn the trust of their crew.
Guardian of the Citadel
Artifact Creature - Construct
Guardian of the Citadel comes into play tapped and doesn't untap during your untap step.
Whenver a player plays a creature card, you may untap Guardian of the Citadel, it loses Defender and gains +5/+0 and first strike. Tap Guardian of the Citadel at the end of your next turn.
Many have tried to pass by the guardians to the Citadel, the bones clustered at the base of the creature, tell a grim warning to all that dare.
As an additonal cost to cast Spellcaster's Referee choose two spells in your hand. Flip a coin. If you win the flip you may choose one of those spells and cast it without paying its mana cost. The other spell is then removed from the game. If you lose the flip remove both spells from the game.