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The same is true for counters that change a creature's power and/or toughness

Haldir goes very well with other cards on this list like Galadhrim Ambush

This includes lands, but also high-mana finishers or planeswalkers that can immediately stabilize your board

FromTheShire: With Domain being a sizeable portion of the current Modern meta in addition to the random inclusions in other decks like Omnath, Locus of Creation I expect this to see some testing in Burn sideboards

Obviously, X-spells were great mana sinks, but artifacts with healthy activation costs were also big-time favorites, and Mishras Factory was a potent buy-out for those spots where you needed to Mana Drain but had nothing to use it on, plus nothing on top of your deck