Domesticated Watercourse
Land
CARDNAME enters the battlefield tapped.
{T}: Add {U} or {B}.
{U}{B}: Until end of turn, CARDNAME becomes an Equipment artifact with equip {2}.
Whenever equipped creature deals combat damage to a player, draw a card.
Jasconian Isle
Land Creature -- Island Fish
3/4
(CARDNAME isn't a spell, it's affected by summoning sickness, it's blue, and it has "{T}: Add {U}.")
CARDNAME enters the battlefield tapped.
CARDNAME doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {U}{U}. If you do, untap CARDNAME.
Rift
Legendary Land
Before drawing your hand, you may start the game with CARDNAME in your opening hand. If you do, draw one fewer card. (Mulligans continue as normal.)
CARDNAME enters the battlefield tapped.
{T}: Add {C}.