2 Cultivator Colossus - $27.99 An incredible new green creature, the Cultivator Colossus costs seven mana to cast, toting trample and power and toughness equal to the number of lands under its owner's control
You could also Donate a permanent to an opponent that hurts them over time, but if they flicker it or if the effect somehow returns the card to you, you might end up stuck with the negative effect again
Thassa, God of the Sea Thassa, God of the Sea is probably your best option for a mono-blue sea creature commander
For gameplay, often the more common versions are better used and still offer the same abilities and strategies, without the risk of damaging a card worth hundreds of dollars during a regular game session
Plus, you get information about whats in your opponents hand for your troubles
This change will appeal to a different type of player who never cared for Planechase