You can Special summon any number of monsters in your hand and face-up on top of your Extra Deck, if their levels are between the Pendulum Scales of the two Pendulum monsters (they cannot equal the Pendulum Scales)
Fittingly enough, this card gets better the earlier you play it, costing nothing if it's your first spell
But because you are, and it breaks their new system if you dont, tough, you lose half your pulls
As long as you have basically anything that can saddle it, Calamity comes down swinging and brings a few extra friends along for the ride, even better if the copies you create have enter-the-battlefield effects
9) Synergy packages: build modules, not spaghetti This is where deckbuilding fundamentals becomes deckbuilding that feels good. Instead of adding one-off synergy pieces that do not connect, build small packages that reinforce your plan