Necroskitter [Eventide] Green Creatures can't attack you unless

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

Set: Portal Three Kingdoms Type: Basic Land — Mountain Rarity: Common ({T}: Add {R}

and a land

Set: Homelands Type: World Enchantment Rarity: Rare Cost: {2}{B}{B} At the beginning of your upkeep

If that mana is spent on an instant or sorcery spell

Necroskitter [Eventide] Green Creatures can't attack you unlessSet: Eventide Type: Creature Elemental Rarity: Rare Cost: {1}{B}{B} Wither (This deals damage to creatures in the form of 1 1 counters.) Whenever a creature an opponent controls with a 1 1 counter on it dies, you may return that card to the battlefield under your control.