Perhaps one of the strongest enchantments that can be run in a zombie-tribal Commander deck, Rooftop Storm allows its controller to pay zero mana rather than the cost of zombie spells they cast
Thats such a negligible downside that its almost laughable, and the fact that this can target any nonland permanents means that it can be used in so many situations that youd be foolish not to have it in your deck
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The first ability is always As an additional cost to cast this spell, you may choose an opponent. Paying a spells gift cost follows the rules for paying additional costs in rules 601.2b and 601.2fh
The creature itself is a good flying threat to put onto the battlefield, but its real power comes from its ability to flicker all non-land permanents you control
Having a copy of [c]Swords to Plowshares[/c] or [c]Abrupt Decay[/c] in your deck is generally a good idea