REDU format ruling
Guardian Eatos

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)If you have no monsters in your Graveyard, you can Special Summon this card (from your hand). You can send 1 of your Equip Spell Cards equipped to this card to the Graveyard, then target up to 3 monsters in your opponent's Graveyard; banish those targets, and if you do, this card gains 500 ATK for each monster banished by this effect, until the end of this turn.
Rulings
(U) If you have no monsters in your GY, you can Special Summon this card from your hand. (1) You can send 1 Equip Spell Card equipped to this card to the GY to select and remove from play up to 3 monsters in your opponent's GY. This card gains 500 ATK for each monster removed by this effect, until the End Phase.
- The (U) Unclassified effect works like a built-in Special Summon. This does not start a Chain.
- The (1) Ignition Effect sends an Equip Spell equipped to this card to the GY for cost.
- You can send an opponent’s Equip Spell equipped to this card to the GY as the cost.
- This effect targets 1, 2, or 3 monsters in your opponent’s GY.
- Removing the targets from play and increasing this card’s ATK occur simultaneously.
- If a target disappears, the other targets are removed from play and Eatos gains ATK accordingly.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.