Comet Storm [Worldwake Promos] Dissension

Comet Storm [Worldwake Promos] DissensionSet: Worldwake Promos Type: Instant Mythic Cost: {X}{R}{R} Multikicker {1} (You may pay an additional {1} any number of times as you cast this spell.) Choose any target, then choose another target for each time this spell was kicked. Comet Storm deals X damage to each of them.

{1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost until end of turn

All efforts at eradication have proved futile

you lose 20 life

Search your library for a green creature card and put it onto the battlefield

sacrifice Conversion unless you pay {W}{W}

you may sacrifice an artifact

Set: Scars of Mirrodin Type: Artifact — Equipment Rarity: Mythic Cost: {3} Equipped creature gets +2/+2 and has protection from green and from blue

Set: Fourth Edition Type: Enchantment Rare Cost: {W} At the beginning of your upkeep

the dwarven forces had reduced the mighty walls to mere rubble

Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step

then discard three cards

and Dominaria itself to the point of annihilation