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Stormtide Leviathan makes all your opponents lands into islands, but its hard to cast and you really only need one island in play anyway, but Harbinger of the Seas almost certainly has several lands it'll affect and get you walking on time

It's good enough to play as a fair value-card in various enchantment decks, but it's also unique enough that you can go all-in building around its ability with various janky combos and synergies if you want to

Esper Sentinel overshot a bit

A Commander deck has 100 cards total, including your commander

The saga I chose for the Lannisters is The Red Wedding as it perfectly showcases their scheming

I may be a while