Outside of their own Loot ability, there are a limitless amount of ways to abuse discard-based abilities like this one
Kefka, Court Mage // Kefka, Ruler of Ruin Rarity: Mythic Rare TYPE: Legendary Creature // Legendary Creature SUBTYPE: Human Wizard // Avatar Wizard CMC: 5 Mana cost: USD: $162.67 EUR: 95.73 TIX: 0.00 EDHREC RANK: 3169 (4/5) Whenever Kefka enters or attacks, each player discards a card
Note that colorless topdeck manipulation like Scroll Rack and Sensei's Divining Top help to get the most from Cait Sith
Archmage Emeritus draws a card for each cast
These cards have the tell-tale rainbow foiling process, much like other foil cards, but with tons of little speckles to give the card a confetti effect
The most important ability is it being able to sacrifice other creatures, put -1/-1 counters on creatures and draw cards