The most relevant rules are: 112.3b Activated abilities have a cost and an effect
We also meet Sami, a human artificer, and their Kavu co-pilot, Tannuk, who are on a personal quest aboard their ship, The Seriema, to find Samis lost cat
-4 Loyalty: Each player sacrifices two creatures of their choice
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Just remember that commander tax is an additional cost, it doesn't increase Maelstrom Wanderer's mana cost, and therefore doesn't boost the effectiveness of Cascade
First, Renewed Solidarity gives your creatures of whatever type you want +1/+0, but thats not where the power is
