Marshland Bloodcaster

Mana cost: {4}{B}
Type: Creature — Vampire Warlock
Power / toughness: 3 / 5
Set: Magic Online Promos #90078 (rare)

Flying
{1}{B}, {T}: Rather than pay the mana cost of the next spell you cast this turn, you may pay life equal to that spell's mana value.

Marshland Bloodcaster has 4 printings, first in Commander 2021 (2021). EDHREC ranks it #11,032 among Commander cards. It appears most in Olivia, Opulent Outlaw decks (1,432 on EDHREC). 2 public decks on TCG run it. It has 4 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Marshland Bloodcaster

Most Wanted - Outlaws of Thunder Junction Commander, led by Olivia, Opulent Outlaw
Witherbloom Witchcraft - Commander 2021, led by Willowdusk, Essence Seer

Commanders that run Marshland Bloodcaster most

Deck counts from EDHREC.

Often played with Marshland Bloodcaster

Cards that show up in the same decks on EDHREC.

Rulings

2021-04-16: Marshland Bloodcaster's ability affects the next spell you cast after the ability has resolved. If you cast any spells in response to the ability, those spells are cast as normal.
2021-04-16: If the next spell you cast has {X} in its mana cost, you must choose 0 as the value of X if you pay life rather than pay its mana cost.
2021-04-16: Even after the ability resolves, you may choose to not pay life rather than pay mana cost of the next spell you cast that turn. However, if you do this, you won't have the opportunity to pay life for any other spells you cast that turn (unless you activate the ability again).
2021-04-16: If you cast a spell for another cost "rather than pay its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Draconic Intervention, those must be paid to cast the card.