Had an odd effect with this card. Using Royal Knight I sent a card to the grave, then opponent used The Fountain in the Sky. Even tho the monster had to be in the grave to use Fountain in the Sky Royal Knight's effect was canceled out.
You can only get 1 as of v1.6.0. However, it's an excellent card for control decks. They're plenty of light monsters with neat effects to help you gain board dominance. This card can not only by you an extra turn in tight spots, but can also help with burn decks or slowing down agro. I run this card with "Wonder Balloons", and "Pumpkin Princess" for board control, and "Freya, Spirit of Victory" to get a little aggro myself.