The owner of this deck hasn't added a sideboard, they probably should...
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Out of two Mythic Rares spawned this really powerful idea that I feel will win most games. Both Liliana and Gisa and Geralf drive the Zombies and their movement to and from the graveyard. Then the blue mana in Gisa and Geralf inspired the use of blue lock-down cards that counter, tap, or return cards to the hand.
I would focus my counters on "remove from the game" cards. I would target strong creatures with many of the tapping spells. I would use the return to hand stuff on anything inconvenient to your objectives. Obviously, these are just general rules. Decks that would most threaten you would be those that attack mostly without creatures. I'd say be aware of those when you're playing and save your counterspells or add more to your sideboard. I don't have one here because sideboards depend somewhat on your preferences and who you might be playing.
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