Altac Bloodseeker — ruling 1

If a combat phase has two combat damage steps (because there’s an attacker or blocker with first strike or double strike), Altac Bloodseeker may gain first strike during the first one. If this happens, it will assign combat damage in the second combat damage step along with other creatures that haven’t assigned combat damage during that combat.

Altac Bloodseeker — ruling 2

If the ability triggers multiple times in a single turn, the power bonuses are cumulative, but the additional instances of first strike and haste are redundant.

Altac Bloodseeker : règles, fonctionnement et interactions (MTG)

Altac 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

Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and as soon as it comes under your control.)

How it works : Altac Bloodseeker

Original English text — Wizards of the Coast / Scryfall

#1July 18, 2014· Wizards of the Coast
If a combat phase has two combat damage steps (because there’s an attacker or blocker with first strike or double strike), Altac Bloodseeker may gain first strike during the first one. If this happens, it will assign combat damage in the second combat damage step along with other creatures that haven’t assigned combat damage during that combat.
No other card is named in this ruling.
#2July 18, 2014· Wizards of the Coast
If the ability triggers multiple times in a single turn, the power bonuses are cumulative, but the additional instances of first strike and haste are redundant.
No other card is named in this ruling.