Joven and Chandler [Unknown Event] Masters 25 Spells of the chosen type

Spells of the chosen type you cast cost {W}{U}{B}{R}{G} less to cast

Set: Saviors of Kamigawa Type: Sorcery — Arcane Rarity: Rare Cost: {5}{B} Target opponent chooses a number

Set: Summer Magic / Edgar Type: Creature — Elf Archer Rarity: Rare Cost: {1}{G} First strike

DragonCon 1994

It is found here

Joven and Chandler [Unknown Event] Masters 25 Spells of the chosen typeSet: Unknown Event Type: Legendary Creature Human Rogue Rarity: Common Backup 2 (When this creature enters the battlefield, put two +1 +1 counters on target creature. If that's another creature, it gains the following abilities until end of turn.) Haste Whenever this creature deals combat damage to an opponent, destroy target artifact that player controls.