REDU format ruling
Crystal Blessing

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Target up to 2 "Crystal Beast" monsters in your Graveyard; place those targets face-up in your Spell & Trap Card Zone as Continuous Spell Cards.
Rulings
- You cannot target more "Crystal Beast" monsters in your GY than you have empty Spell & Trap Card Zones when you activate this card.
- If you have no empty Spell & Trap Card Zones when this card resolves due to an effect chained to this card, you cannot place any "Crystal Beast" monsters in your Spell & Trap Card Zones.
- If you target 2 "Crystal Beast" monsters in your GY, but the number of your empty Spell & Trap Card Zones is reduced to 1 by an effect chained to this card, you can choose which of those 2 cards to place in your Spell & Trap Card Zones when this card resolves.
- If an effect like D.D. Crow is chained to Crystal Blessing to remove one of the targeted Crystal Beast monsters from your GY, the remaining target is still placed in your Spell & Trap Card Zone.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.