msem-instigator

Whenever Brine Kelpie attacks, you may tap target creature an opponent controls.
Ride {2}{U} ({2}{U}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

Target creature gets +3/+0 until end of turn. Mill three cards.

When Broadside Raider enters the battlefield, create a 1/1 blue and red Pirate creature token with haste.

Flash
Whenever you cast your second spell each turn, put a +1/+1 counter on Brooding Replacement.

Two target creatures you control each get +2/+1 until end of turn.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack with exactly two creatures, add a quest counter.
1, 2 — Reveal the top four cards of your library. You may put a creature card from among them into your hand. Put the rest on the bottom in a random order.
3 — Put two +1/+1 counters on each of up to two target creatures you control.
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Brushfire deals 3 damage to target creature. If that creature would die this turn, exile it instead.

Target opponent sacrifices a creature.
Rerun (If you cast this from your hand, exile it as it resolves. Whenever a creature you control dies, you may cast this card from exile without paying its mana cost.)

When Bubbledome Chorister enters the battlefield, create a green Aura enchantment token named Sanctum's Gift attached to target creature. The token has enchant creature and “Enchanted creature has ‘{T}: Add {G} for each enchanted creature you control.'”

When Bubblespout Sentry enters the battlefield, look at the top card of your library. You may put it into your graveyard.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Budding Companion has three or more +1/+1 counters on it, remove them all and transform it.

Whenever you cast a spell for its showcase cost, create a 2/2 blue Drake creature token with flying.

{3}{U}, {T}: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

Target player mills four cards, then mills an additional four cards for each Curse attached to them.

Flash
Enchant creature
Enchanted creature gets +1/+1 and has hexproof.

First strike
Ascend {1}{B} ({1}{B}: Exile this creature, then return it to the battlefield transformed. Ascend only as a sorcery.)

When Burglar Cat enters the battlefield, exile the top card of target opponent's library. You may play that card during any turn you attacked with a Rogue, and you may spend mana as though it were mana of any color to cast it.

Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.)
Enchanted creature gets +1/+0.
Whenever enchanted creature deals combat damage to a player, you may draw a card.

At the beginning of your upkeep, reveal the bottom card of your library, then you may pay {B} and 3 life. If you do, put it into your hand. Otherwise, exile it.

Exile target artifact or enchantment with mana value 4 or less.

Exile the top card of your library. You may play that card until the end of your next turn.

Burn the Witch deals 3 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.

Vanishing 3 (This permanent enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a time counter is removed from Burning Heels, exile the top card of your library. Until end of turn, you may play that card.

Destroy target land an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.
Draw a card.

You may cast this spell as though it had flash if it targets a creature or planeswalker.
Burning Up deals X damage to any target, where X is the number of basic land types among lands you control.