Harmony of Nature [Portal Second Age] Wraith {T}: Target creature gains islandwalk

{T}: Target creature gains islandwalk until end of turn

Set: Rise of the Eldrazi Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {15} This spell can't be countered

{4}: Put a +1/+1 counter on Walking Ballista

Then exchange control of artifacts the same way

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

Harmony of Nature [Portal Second Age] Wraith {T}: Target creature gains islandwalkSet: Portal Second Age Type: Sorcery Rarity: Uncommon Cost: {2}{G} Tap any number of untapped creatures you control. You gain 4 life for each creature tapped this way.