Magic: The Gathering Oracle Changes - Ravnica: City of Guilds to Guildpact

Old card (Ravnica: City of Guilds)	New card (Guildpact)
Corrosion [Click to view all changes.]
Corrosion {1}{B}{R} Enchantment Cumulative upkeep {1} At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then, for each artifact any opponent controls, if the number of rust counters on that artifact equals or exceeds its converted mana cost, destroy the artifact. Artifacts destroyed this way can't be regenerated. When Corrosion leaves play, remove all rust counters from all artifacts.	Corrosion {1}{B}{R} Enchantment Cumulative upkeep {1} At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with converted mana cost less than or equal to the number of rust counters on it. Artifacts destroyed this way can't be regenerated. When Corrosion leaves play, remove all rust counters from all permanents.

Old card (Ravnica: City of Guilds)

New card (Guildpact)

Corrosion

{1}{B}{R}

Enchantment

Cumulative upkeep {1}

At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then, for each artifact any opponent controls, if the number of rust counters on that artifact equals or exceeds its converted mana cost, destroy the artifact. Artifacts destroyed this way can't be regenerated.

When Corrosion leaves play, remove all rust counters from all artifacts.

Corrosion

{1}{B}{R}

Enchantment

Cumulative upkeep {1}

At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with converted mana cost less than or equal to the number of rust counters on it. Artifacts destroyed this way can't be regenerated.

When Corrosion leaves play, remove all rust counters from all permanents.