Confirmed art and effects, finally!
Doomstar Magician
Level 4 DARK Spellcaster-Type Effect Monster
ATK 1800
DEF 300
Once per turn: You can discard 1 card, then target 1 card in either player’s Pendulum Zone; destroy that card, and if you do, draw 1 card.
U.A. Mighty Slugger
Level 5 EARTH Warrior-Type Effect Monster
ATK 2300
DEF 700
You can Special Summon this card (from your hand) by returning 1 “U.A.” monster you control to the hand, except “U.A. Might Slugger”. You can only Special Summon “U.A. Might Slugger” once per turn this way. If this card attacks, your opponent cannot activate cards or effects until the end of the Damage Step.
U.A. Perfect Ace
Level 5 EARTH Warrior-Type Effect Monster
ATK 1500
DEF 2500
You can Special Summon this card (from your hand) by returning 1 “U.A.” monster you control to the hand, except “U.A. Perfect Ace”. You can only Special Summon “U.A. Perfect Ace” once per turn this way. Once per turn this way. Once per turn, during your opponent’s turn, when a card or effect is activated: You can discard 1 card; negate that activation, and if you do, destroy it (this is a Quick Effect).