Glisten (Blue) [MON071] (Monarch) 1st Edition Normal Condition:Moderately Played 1st Edition Normal then you may discard a

then you may discard a card

Set: Innistrad: Crimson Vow Commander Type: Land Rarity: Rare {T}: Add one mana of any color that a land an opponent controls could produce

Others aren't so obvious

Set: Time Spiral Remastered Type: Sorcery — Rarity: Uncommon Cost: {3}{R}{R} Shivan Meteor deals 13 damage to target creature

"When the kumo attacked the monks' sacred shrine

Glisten (Blue) [MON071] (Monarch) 1st Edition Normal Condition:Moderately Played 1st Edition Normal then you may discard aSet: Monarch Edition: 1st Edition Finish: Regular Type: Instant Rarity: Rare Class: Light Cost: 2 Distribute up to two +1 [Power] counters among any number of weapons you control. At the beginning of your end phase, remove all +1 [Power] counters from weapons you control. (If a permanent is no longer a weapon during your end phase, +1 [Power] counters on it are not removed.)