At the beginning of combat on your turn, Thrill of the Trendchase becomes a copy of a creature on the battlefield chosen at random until end of turn, except it's a 5/5 red Elemental with flying and haste and isn't legendary if the chosen creature is legendary.

Enchant creature
As long as enchanted creature has flying, each creature you control has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

As Top of the Charts enters, choose a mana value.
Creatures with the chosen mana value get +1/+1. All other creatures get -1/-1.

First strike
Whenever Tormenting Lightrider attacks, if defending player has 10 or less life, Tormenting Lightrider gains double strike until end of turn.
At the beginning of your end step, if a creature died this turn, each opponent loses 3 life unless they discard a card or sacrifice a nonland permanent.

{B}, Sacrifice another creature: Create a tapped Treasure token. Scry 1.
{1}{B}: Exile two target creature cards from graveyards. You may cast up to one of those cards for as long as they remain exiled.

Flying
{1}{VP}{VP}, {T}: Tap target creature.

Draw two cards.
Up to one target creature gains flying until end of turn.

Ward {1}
When Transfixing Troupe enters, exile target creature an opponent controls until Transfixing Troupe leaves the battlefield.

This spell costs {1} less to cast for each Elemental you control.
Haste

Tree of Clues enters tapped.
{T}: Add {B}, {R}, or {G}.
{VP}{VP}{VP}{VP}, Discard Tree of Clues: Target creature gets +3/+3 and gains flying until end of turn.

Whenever you scry, put a +1/+1 counter on Trend Oracles.

{T}: Add one mana of any color.

This spell costs {3}{B} less to cast if a creature died this turn.
Destroy target creature.

Equipped creature gets +1/+0.
Whenever equipped creature attacks, you may cast an instant or sorcery card from your hand with mana value X or less without paying its mana cost, where X is equipped creature's power.
Equip {2}

As long as it's your turn, Ultraviolet Maniac has lifelink.
{VP}{VP}{VP}: Until end of turn, whenever you gain life, each opponent loses that much life.

Uncharted Haven enters tapped.
As Uncharted Haven enters, choose a color.
{T}: Add one mana of the chosen color.

As long as Undeniable Groove has power 4 or greater, it must be blocked if able.

At the beginning of your upkeep, create a 1/1 red Fan creature token. Then if you control two or more Fans, create another one of those tokens. Then if you control five or more Fans, Underground Sensation deals 2 damage to any target and you gain 2 life.
{3}{R}{W}: Create a 1/1 red Fan creature token.

Choose up to four target permanents. If you control a creature, destroy a creature chosen this way. Repeat this process for artifacts, enchantments, and planeswalkers.

Deathtouch
{1}{VP}{VP}: Variegated Shade gets +2/+2 until end of turn.

Whenever you cast a spell with {VP} in its mana cost or activate an ability with {VP} in its cost, Venus, the Basilisk fights up to one target creature you don't control.

Lifelink
When Vibeseeker enters, scry 1.

Vigorous Soundvein enters tapped.
When Vigorous Soundvein enters, you may pay 1 life. If you do, add one mana of any color other than green.
{T}: Add {G}.

At the beginning of your end step, if you control three or more untapped lands, you may exile another target permanent you control, then return it to the battlefield under its owner's control.
{1}{U}{U}: Scry 1.

Drop — When Viral Upstarts enters, if you didn't cast any creature spells during your last turn, draw a card and you lose 1 life.