Mishra's Helix [Urza's Saga] Nightmare Horror Whenever a land's ability causes

Whenever a land's ability causes you to add one or more mana of the chosen color

Only those who have proved themselves worthy are granted a dragon's scale

then reveal the top card of your library

"Here in Fyndhorn

Set: Dominaria Prerelease Promos Type: Creature — Elf Knight Rarity: Rare Cost: {G}{G}{G} Steel Leaf Champion can't be blocked by creatures with power 2 or less

Mishra's Helix [Urza's Saga] Nightmare Horror Whenever a land's ability causesSet: Urza's Saga Type: Artifact Rarity: Rare Cost: {5} {X}, {T}: Tap X target lands. The helix was the finest example of Mishra's campaign strategy: if he couldn't have Argoth, no one could.