You can drop him turn two and attack on turn three after dropping Sam and making a Food
There's no news of any errata fixes for Ursula as yet though, so the speculation that this will be a super-rare error card is just that, speculation
owyn, Lady of Rohan owyn, Lady of Rohans cost reduction on equipment can be helpful, but I personally think there are just better options out there for an equipment commander
Slowpoke has the following attacks: Water Gun - 20 damage
The mana simply appears in your pool
Reconstructed Thopter stands out as a solid Wind Drake-type creature with unearth that all colors will be able to use, and you could consider Argivian Avenger in that same spot for a bigger, higher impact but less curve fitting creature