Zombie Master

Edison Card Text
① Once per turn: You can send 1 monster from your hand to the GY, then target 1 Level 4 or lower Zombie in any GY; Special Summon that target.
(activate and resolve only if this card is face-up on the field).
Targets
No Damage Step effect
Banlist • Unlimited
Interactions
Does Zombie Master need to be face-up to resolve its effect?✓
Zombie Master is face-down when its effect would resolve.
Yes. Zombie Master must be face-up to activate and resolve its effect.
Can Zombie Master discard a Zombie from hand and Special Summon that same card?✓
You have at least 1 Zombie in the Graveyard and want to activate Zombie Master.
Yes. Zombie Master requires a valid Zombie target in the Graveyard at activation so you have to have at least 1 Zombie that you can Special Summon using its effect, but you can select any Zombie in the Graveyard after paying the cost, including the one you discarded.
Rulings
edisonformat.net
● You can't activate this effect unless there is a level 4 or lower Zombie in either GY.
When this effect resolves, you can target the discarded card if it is a level 4 or lower Zombie.
● If that target isn't a Zombie when this effect resolves, it isn't summoned.
edisonformat.com
No edisonformat.com ruling available.