Sacrifice after III.) I - Gungnir - Destroy target creature an opponent controls.II - Zantetsuken - This creature gains "Whenever this creature deals combat damage to a player, that player loses the game."III - Hall of Sorrow - Draw two cards
In the TCG, side decking can hurt Eldich, but since that isn't in Master Duel, if you go first, odds are you'll be able to win the game
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Don't worry about tapping your entire board state as needed, Merrow CommerceMerrow Commerce untaps each Merfolk at the end of your turn
HIT Decimator of the Provinces has a lot of Constructed applications