Essence Sliver [Legions] San Diego Comic-Con 2017 you may change "swampwalk" to

you may change "swampwalk" to "plainswalk

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Change the target of target spell with a single target unless that spell's controller pays {2}

Set: Portal Three Kingdoms Type: Creature — Human Soldier Rarity: Rare Cost: {3}{R} Horsemanship (This creature can't be blocked except by creatures with horsemanship

he focused his mind on a single goal

Essence Sliver [Legions] San Diego Comic-Con 2017 you may change "swampwalk" toSet: Legions Type: Creature Sliver Rarity: Rare Cost: {3}{W} Whenever a Sliver deals damage, its controller gains that much life. The slivers would survive, even at the expense of every other creature on Otaria.