Saint Dragon, God of Osiris

As an additional cost to cast, sacrifice three creatures. Cannot summon in others ways.
Flying, indestructible, haste
When comes into play, can't be countered,
and all players cannot cast spells or activate abilities until end of turn. All opponents creatures gets -25% Power and Toughness.
{7}{r}{w}: Thunderforce Attack — Destroy all
enemies creatures.