Damn to Hell deals X damage divided as you choose among any number of target creatures and/or planeswalkers and you gain X life, where X is the number of Swamps you control plus the number of cards with a cycling ability in your graveyard.
Swampcycling {2}

Vigilance
Whenever Darisha enters or attacks, create a white enchantment token named Stratagem with “Creatures you control get +1/+1.”

Vigilance
Whenever Dark Ambassador attacks, exile up to one target creature, then return that card to the battlefield tapped under its owner's control.

Flying
When Daybreak Rider enters, you may bless another target creature.

Trample
When this creature dies, exile the top five cards of your library. Until the end of your next turn, you may cast a nonland card from among them by paying life equal to its mana value rather than pay its mana cost.

When Demolition Team enters, teach target creature trample. If you put a +1/+1 counter on it this way, it must be blocked this turn if able.

Depths Ancient's power and toughness are each equal to the number of cards in your graveyard plus the number of exiled cards you own with surface.
Surface {5}{B}{B}

When Desolate Lands enters and whenever you cast a spell, it deals 3 damage to target opponent unless they sacrifice a permanent.

When you cast this spell, you may choose another creature it could target. If you do, copy it. The copy targets that creature.
Enchant creature
Enchanted creature gets +2/+2.

Integrate target creature.

You may pay {1}{B} rather than pay this spell's mana cost. When you do, target opponent creates two 1/1 white Citizen creature tokens.

This spell costs {2} less to cast if you control a creature with a level counter on it.
Flying

Vigilance
Once each turn, when you activate a nonmana ability, you may copy it. You may choose new targets for the copy.
{1}{U}{R}{W}, {T}: Tap target creature. Echocrafter deals 1 damage to that creature's controller.

Scry 3, then draw three cards.
If this spell's flashback cost was paid, take an extra turn after this one.
Flashback {7}{U}{U}

When Elder Soulblade enters, search your library and/or graveyard for a creature card with mana value 2 or less. Put that card onto the battlefield, attach Elder Soulblade to it. If you searched you library this way, shuffle.
Equipped creature gets +3/+1 and has menace.
Equip {5}

Lifelink
Whenever Empowered Revisionary attacks, if its power is greater than its base power, create a number of 1/1 colorless Soldier creature tokens equal to the difference.

When Enlightenment enters, draw a card for each color of mana spent to cast it.
You have no maximum hand size.

This spell can't be countered.
Whenever Eviviva enters or attacks, create a 2/2 red Warrior creature token with “Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.”

{3}{R}: Exile the top card of your library. You may play that card until the end of your next turn.
{7}{R}: Exotic Transformer deals damage equal to its power to any target.

Explosive Redemption deals 4 damage to target creature. When that creature dies this turn, return it to the battlefield under your control. It gains haste. Sacrifice it at end of turn.

Fabric — When this creature enters, add X mana in any combination of colors, where X is the number of enchantments you control.
{1}{R}, Discard a card: Draw a card.

Whenever a creature dealt damage by Fleshbearer this turn dies, integrate that creature.
Fleshbearer gets +2/+0 and has menace as long as a creature card is integrated onto it.

Approval — When Flock Favorites enters, exile the top X cards of your library, where X is the number of colors among permanents you control. Until the end of your next turn, you may play those cards.

Whenever Floe Master enters or another creature you control surfaces, tap up to one target creature and put a stun counter on it.
Surface {5}{U}{U}

When Forgemaster Dreadnought enters, create three Treasure tokens.
Spellcharge 9