You should also clean your Play-Mats regularly, preferably by hand washing (and not in the washing machine!): wash the play-mat with warm water and a mild detergent or soap, then spread it out to dry - that's it.
They also had a 3-color cycling cost, associated with the basic land types they could fetch
The PSA 9 Mint is the most documented copy of this card, even being the image on Bulbapedia
Attack, no blocks, they think they are going to fifteen commander damage, you pump +6/+0, and they lose
Thassa, God of the SeaThassa, God of the Sea is good, but she's not a Merfolk, and there are other ways that my creatures can swing in for damage
Brawl This is a viable option if you enjoy playing on Arena but dont always want to draft, play constructed, or enter an event