Since Deadpool, Trading Card is legendary, unless you have a card that shuts down the legend rule like Mirror Box or the Master, all your Orthion copies will be immediately sacrificed
That said, Im not sure that sets like Iconic Masters or Masters 25 had the same impact
Addendum - If you cast this spell during your main phase, put a +1/+1 counter on each of those creatures and they gain vigilance until end of turn
This makes Be'lakor very strong not just when it enters, but also passively throughout the game
Speaking of which lets jump into some of the mechanics
And for a brief second, while playing a trading card game, you remember why Final Fantasy 7 remains the most impactful game in the series to date.