Tengu format ruling
Crystal Tree
Card effect (current official text)Each time a "Crystal Beast" monster(s) is placed in either player's Spell & Trap Zone, place 1 Crystal Counter on this card. You can send this card to the GY; take a number of "Crystal Beast" monsters from your Deck equal to the number of Crystal Counters that were on this card, and place them face-up in your Spell & Trap Zone as Continuous Spells.
Rulings
- Crystal Tree's effect cannot be activated if you do not have enough Crystal Beast monsters remaining in your Deck. Example: If you have 4 Crystal Counters on Crystal Tree but only 3 Crystal Beast monsters remaining in your Deck, you cannot activate Crystal Tree's effect.
- Crystal Tree's effect cannot be activated if you do not have enough open Spell and Trap Card Zone spaces for the Crystal Beast monsters that would be placed into your Spell and Trap Card Zone with Crystal Tree's effect. Example: If you have 4 Crystal Counters on Crystal Tree but only 2 open Spell and Trap Card Zone spaces, you cannot activate Crystal Tree's effect.
- When a Crystal Beast monster is equipped to Relinquished with its effect, a Crystal Counter is placed onto Crystal Tree.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.