The List

Artifact

Mishra's Helix

Eighth Edition

Instant

Catalog

World Championship Decks 2000

Enchantment

At the beginning of your upkeep, you may put a verse counter on this enchantment.
Sacrifice this enchantment: Counter target spell unless its controller pays {X}, where X is the number of verse counters on this enchantment.

Lilting Refrain

Battle Royale Box Set

Creature — Human Cleric

{1}{W}: Prevent all combat damage that would be dealt this turn by target attacking creature with flying.

Songstitcher

Urza's Saga

When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature.

Opal Caryatid

Whenever an opponent plays a land, if this permanent is an enchantment, it becomes a 3/2 Elk Beast creature.
Whenever you play a land, if this permanent is a creature, it becomes an enchantment.

Hidden Stag

{X}, {T}: Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle.