Untap, upkeep... Pitching a Swamp.
You either have Riptide or I win. Declaring attackers...?
Spidey: 5
Hand: 5
In Play:
(U,U,U,U) Forest x4
(U) Island
(T,T) Plains x2
Mana Vortex (At the beginning of each player's upkeep, that player sacs a land. When there are no lands in play, sac ~)
(U) Stone Calender (Spells I play cost up to 1 less to play)
(U) Niall Silvain (2/2, GGGG, T: Regenerate target creature)
Graveyard: Inquisition, Swamp, Erosion, Scavenger Folk, Holy Light, Murk Dweller, Land Leeches, Holy Light, Island, Island, Tividar's Crusade
RFG:
rokapoke: 17
Hand: 5
In Play:
(UU) Mountain x2
(U) Forest
(TTU) Island x3
(U) Plains
(U) Maze of Ith (T: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.)
Sunken City (At the beginning of your upkeep, sacrifice SC unless you pay UU. Blue creatures get +1/+1.)
War Barge (3: Target creature gains Islandwalk until EOT. When WB leaves play this turn, destroy that creature. A creature destroyed this way can't be regenerated.)
(U) Giant Shark (5/5, GS can't attack unless defending player controls an Island. Whenever GS blocks or becomes blocked by a creature that has been dealt damage this turn, GS gets +2/+0 and gains trample until EOT. When you control no Islands, sacrifice GS.)
Graveyard: Scarwood Goblins, Marsh Goblins, Land Leeches, Goblin Rock Sled, Electric Eel, Marsh Viper, Forest, Goblin Hero, Swamp
RFG: