Cannot be Normal Summoned or Set. Must be Special Summoned (from your hand) by Tributing 3 monsters, including at least 1 "Destiny HERO" monster, and cannot be Special Summoned by other ways. If you still control this face-up card during your opponent's next Standby Phase after you Special Summoned it: Halve your opponent's Life Points.
Requiring 3 tributes may sound like a hefty price, but the cards in the structure box itself can help with swarming the field.
Destiny HERO - Drilldark - If you already have 1 monster on the field, you can summon Drilldark to special summon another monster from your hand. With 3 monsters already on the field, you can use it to tribute summon Dogma, but you'll end up with a big card disadvantage so it's only recommended if it's enough to win you the duel right away.
Destiny HERO - Dreamer - This card can protect a monster you control from being destroyed by battle, including itself if you have another Dreamer in your graveyard, and summon itself to the field. It can be an effective way to stall, but the main downside of this is that you can only get more than 1 copy of this card through in-app purchase.
D Cubed - Summoning this lets you special summon 1 or 2 D Cubed from your hand, deck, and/or graveyard. You'll need to bring 3 of this card in your deck which can potentially create "bad hands", and it requires 1/2 discards to activate the effect, but it can be good if you ever want to make a turbo Dogma type of deck.
Halving your opponent's LP even when they have full (4000 without the use of LP increasing cards) is already pretty big damage. You could finish off your opponent by pairing Dogma with burn cards to help finish the duel without even having to attack.
Tributes for cost
Cannot Normal Summon / Cannot Set / Nomi / Special Summons itself from your hand
Halves Life Points / Your opponent loses Life Points
Yeah.. The summoning condition is too hard in this current format. And the eff activation only applied once after this card summoned, basically, Plasma still better as he negate opp's monster eff. The only downside Plasma has is his low deffence