Tectonic Instability [Invasion] Dragon Shield If you sacrifice an Island

If you sacrifice an Island this way

Set: Commander 2015 Type: Land Rarity: Rare As Ancient Amphitheater enters the battlefield

or a 1/6 Wall artifact creature with defender in addition to its other types

Set: Planechase Type: Creature — Zombie Rarity: Uncommon Cost: {2}{B}{B} Zombie spells you cast cost {1} less to cast

exile equipped creature

Tectonic Instability [Invasion] Dragon Shield If you sacrifice an IslandSet: Invasion Type: Enchantment Rarity: Rare Cost: {2}{R} Whenever a land enters the battlefield, tap all lands its controller controls. "Think of the problems we'll face if you uproot entire continents," said Urza. "I have," replied Teferi, "but the alternative is worse."