At the beginning of your end step, Leystone of Storms deals 1 damage to each opponent. Then if it's your first turn of the game or you discarded a card named Leystone of Storms this turn, Leystone of Storms deals 1 damage to any target.
Cycling {R}

Whenever you cast an instant spell, up to one target creature gets +2/+2 until end of turn.
Whenever you cast a sorcery spell, reveal the top card of your library. If its mana value is less than the greatest power among creatures you control, put it into your hand.

This spell costs {2} less to cast if you attacked with a legendary creature this turn.
Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

{T}: Add {R}{R}{R}. Spend this mana only to cast creature spells. If that mana is spent on a creature spell, it enters with an additional haste counter and decayed counter on it.

{5}: Lightspeed Cruiser becomes an artifact creature until end of turn.
Crew 2

Attacking creatures you control have first strike.
Whenever you amp it up, draw a card.

Lightvein Arrow deals 3 damage to any target. Scry 1.

Enchant land
When Lightvein Discovery enters, put a +1/+1 counter on target creature you control.
Enchanted land has “{T}: Add two mana of different colors.”

Untap target creature. It gets +2/+2 and gains indestructible until end of turn.

{1}, {T}: Target land you control becomes a 4/4 Elemental creature with lifelink, haste, and “When this creature dies, draw a card.” It's still a land. Sacrifice it at the beginning of the next end step.

Menace
Other Elementals you control have menace.

Destroy target creature or planeswalker. Its controller creates a Treasure token.

Whenever Lithe Stalker or another artifact you control enters, artifact creatures you control gain first strike until end of turn.

Enchant creature
Enchanted creature gets +2/+2.
Wander {2}{W}

Create a 2/2 blue Drake creature token with flying.
Whenever a creature you control enters, if it wandered, you may exile Lofty Frontiers from your graveyard. If you do, create a 2/2 blue Drake creature token with flying.

Flying
When Lofty Voter enters, make a pledge.

Solidarity
Londel Sharpshot can't be blocked by creatures with power 2 or less.

Put any number of target noncreature cards from your graveyard on top of your library in any order.
Draw a card, then exile Long-Lost Legacy.

Flash
Flying, lifelink
Your opponents can't create tokens.

Looming Skyscrapers enters tapped.
{T}: Add {B} or {G}.
{4}: Make a pledge. Activate only as a sorcery.

Menace
{B}{R}: Target creature with power 4 or less can't be blocked by more than one creature this turn.

Kraken, Leviathan, Octopus, and Serpent spells you cast cost {X} less to cast, where X is your devotion to blue.

Indulgence
When Lost in the Moment enters, draw a card then discard a card.
Whenever you indulge, each opponent mills four cards.

Create X blue Shrine enchantment tokens named Unmarked Shrine with “At the beginning of your upkeep, each opponent mills a card.”
{1}{U}, Exile Lost to Memory from your graveyard: Draw two cards. Activate only if an opponent has eight or more cards in their graveyard.

Flash
When Louna, the Ever-Learning enters, for each kind of counter among permanents you control, you may put a counter of that kind on Louna, the Ever-Learning.