Ravenous Bloodseeker — ruling 1

You can activate Ravenous Bloodseeker's ability any number of times to discard several cards. It will be put into its owner's graveyard once its toughness is 0 or less. Any other instances of the ability still on the stack will resolve with no effect.

Ravenous Bloodseeker : règles, fonctionnement et interactions (MTG)

Ravenous Bloodseeker is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Discard a card: This creature gets +2/-2 until end of turn.

How it works : Ravenous Bloodseeker

Original English text — Wizards of the Coast / Scryfall

#1April 8, 2016· Wizards of the Coast
You can activate Ravenous Bloodseeker's ability any number of times to discard several cards. It will be put into its owner's graveyard once its toughness is 0 or less. Any other instances of the ability still on the stack will resolve with no effect.
No other card is named in this ruling.