+Calamity (14)
If a Giant source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Calamity of Cinders deals 6 damage to each untapped creature.
As an additional cost to cast this spell, reveal a colorless creature card from your hand.
Exile each creature and planeswalker with mana value less than the revealed card's mana value.
Haste
Whenever Calamity, Galloping Inferno attacks while saddled, choose a nonlegendary creature that saddled it this turn and create a tapped and attacking token that's a copy of it. Sacrifice that token at the beginning of the next end step. Repeat this process once.
Saddle 1
Exile all graveyards. Players can't cast noncreature spells this turn. Exile Calamity's Wake.
Whenever a creature you control with power 1 or less attacks, Cavalcade of Calamity deals 1 damage to the player or planeswalker that creature is attacking.
Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total mana value of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs.
Trample
Whenever Deus of Calamity deals 6 or more damage to an opponent, destroy target land that player controls.
Deathtouch
You may look at the top card of your library any time.
You may play lands and cast spells with mana value 4 or greater from the top of your library.
: Surveil 2.
You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile Invoke Calamity.
Reveal the top X cards of your library. For each card type, you may exile a card of that type from among them. Put the rest into your graveyard. You may cast a spell from among the exiled cards without paying its mana cost if you exiled four or more cards this way. Then put the rest of the exiled cards into your hand.
Destroy target creature with power or toughness 4 or greater.
Myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
Whenever Scion of Calamity deals combat damage to a player, destroy target artifact or enchantment that player controls.
Vigilance, reach, trample
When Zacama, Primal Calamity enters, if you cast it, untap all lands you control.
: Zacama deals 3 damage to target creature.
: Destroy target artifact or enchantment.
: You gain 3 life.
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: Zacama deals 3 damage to target creature.
: Destroy target artifact or enchantment.
: You gain 3 life.