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Since K-9, Mark I only costs one mana, you can start taking advantage of the card very early on
In most situations, a wall of Marshmallons with a Gravity Bind behind them is usually a fairly impenetrable defense
Islandwalk : 6 cards Turning Islandwalk into unblockable : 3 cards Tap/Untap Synergy : 11 cards Deeproot Pilgrimage, Merrow Commerce, Kioras Follower, Kumena, Tyrant of Orazca, Lullmage Mentor, Merfolk Sovereign, Merrow Reejerey, Seahunter, Empress Galina, Murkfiend Liege, Twists and Turns // Mycoid Maze Although the optimal Merfolk Tribal commander for tap/untap strategy is Kumena, Tyrant of Orazca, untap strategy also works well in our Merfolk Tribal build too, either as support to our aggro strategy (untap is enabling our creatures to block even after attacking) or as an amplifier of our creatures with powerful tap abilities (among them is Kumena, Tyrant of Orazca as part of the 99)