Rakshasa Vizier — ruling 1

If a card is exiled “instead” of being put into a graveyard, Rakshasa Vizier’s ability won’t trigger.

Rakshasa Vizier — ruling 2

Exiling cards from your graveyard to pay the cost of a spell with delve is a single action. It will cause Rakshasa Vizier’s ability to trigger once, putting a number of +1/+1 counters on it equal to the number of cards you exiled.

Rakshasa Vizier : règles, fonctionnement et interactions (MTG)

Rakshasa Vizier 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 one or more cards are put into exile from your graveyard, put that many +1/+1 counters on this creature.

How it works : Rakshasa Vizier

Original English text — Wizards of the Coast / Scryfall

#1September 20, 2014· Wizards of the Coast
If a card is exiled “instead” of being put into a graveyard, Rakshasa Vizier’s ability won’t trigger.
No other card is named in this ruling.
#2September 20, 2014· Wizards of the Coast
Exiling cards from your graveyard to pay the cost of a spell with delve is a single action. It will cause Rakshasa Vizier’s ability to trigger once, putting a number of +1/+1 counters on it equal to the number of cards you exiled.
No other card is named in this ruling.