You don't lose unspent mana as steps and phases end.
At the beginning of your end step, if you've spent at least five mana to cast spells this turn, draw a card. If you've spent at least ten, create a 10/10 green Elemental creature token. If you spent at least twenty, you gain 20 life. If you spent at least fifty, you win the game.

Corrupt — When this Subroutine enters, if you control a permanent with greater mana value, it runs.
Whenever this Subroutine runs, create two 1/1 white Citizen creature tokens. They gain haste until end of turn.

Put a +1/+1 counter on each creature you control.
Cycling {1}{G}
When you cycle this card, put a +1/+1 counter on target creature you control.

Trample
Solidarity

Revered
Trample

{2}, Sacrifice a creature: Teach target creature menace.

Solidarity
Whenever Battlehymn Howler attacks, add an amount of {G} equal to its power. Until end of turn, you don't lose this mana as steps and phases end.

When Beguiling Stewards enters, if it's not a token, create a token that's a copy of it.
Beguiling Stewards has deathtouch as long as you control another creature named Beguiling Stewards.

At the beginning of combat of your turn, Belief-Belying Beast gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Ruins you control can't be blocked by creatures with power 2 or less.
{1}, {T}: Put a +1/+1 counter on target Ruin.
Spellcharge 5

When Berry Fermenter enters, create a Berry token.
{2}, Sacrifice a Berry: You gain 3 life.
{T}, Sacrifice a Berry: Add one mana of any color.

{R}, {T}: Target creature gets +1/+0 and gains menace and haste until end of turn. Activate only as a sorcery.
{6}{R}{R}, {T}: Creatures you control get +1/+0 and gain menace and haste until end of turn. Activate only as a sorcery.

Equipped creature gets +1/+2 and has “At the beginning of your end step, put a time counter on Blade of Bright Futures.”
{2}, Sacrifice Blade of Bright Futures: You gain X life and draw X cards, where X is one plus the number of time counters on it. Activate only as a sorcery.
Equip {2}

Equipped creature gets +2/+1 and has “At the beginning of your end step, put a time counter on Blade of Clouded Pasts.”
{2}, Sacrifice Blade of Clouded Pasts: Target player loses X life and discards X cards, where X is one plus the number of time counters on it. Activate only as a sorcery.
Equip {2}

Haste
When this creature enters, put a +1/+1 counter on target creature you control.

Whenever an attacking creature you control dies, Bleeding Edge Memorial deals 1 damage to defending player.
Spellcharge 4

Bleeding Out deals 3 damage to any target. Excess damage dealt to a creature or planeswalker this way is dealt to its controller instead.

Enchant creature
Enchanted creature has double strike.

Target creature gets +2/+2 until end of turn and must be blocked this turn if able. Untap up to one target creature. It blocks this turn if able.
Surface {4}{G}

Damned — When this creature enters, if you've sacrificed a permanent this turn, this creature deals 2 damage to each opponent.

Whenever Bloom Brute deals combat damage to a player, create two Berry tokens.

Revered
Whenever this creature attacks, you may pay {2} and discard a card. If you do, draw a card.

Choose one. If you control a Weather as you cast this spell, you may choose both instead.
• Put a +1/+1 counter on target creature for each basic land type among lands you control.
• Target creature you control deals damage equal to its power to target creature you don't control.

Choose one. If you control a Weather as you cast this spell, you may choose both instead.
• Creatures you control get +2/+1 until end of turn.
• Boiling Storm deals 2 damage to each creature.

At the beginning of your upkeep, create a Treasure token.
Whenever you sacrifice an artifact or enchantment, this creature deals 1 damage to each opponent.