Rowan, Fearless Sparkmage — ruling 1

Rowan's second ability can't target the same creature twice to deal 2 damage to it.

Rowan, Fearless Sparkmage — ruling 2

If a target of Rowan's second ability is a legal target but an effect prevents the damage that would be dealt to it, that creature still can't block this turn.

Rowan, Fearless Sparkmage — ruling 3

Rowan's third ability can affect creatures you already control or ones that are already untapped. It will untap them if applicable and give them haste.

Rowan, Fearless Sparkmage — ruling 4

Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.

Rowan, Fearless Sparkmage : règles, fonctionnement et interactions (MTG)

Rowan, Fearless Sparkmage 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

+1: Up to one target creature gets +3/+0 and gains first strike until end of turn. −2: Rowan deals 1 damage to each of up to two target creatures. Those creatures can't block this turn. −9: Gain control of all creatures until end of turn. Untap them. They gain haste until end of turn.

How it works : Rowan, Fearless Sparkmage

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2019· Wizards of the Coast
Rowan's second ability can't target the same creature twice to deal 2 damage to it.
No other card is named in this ruling.
#2October 4, 2019· Wizards of the Coast
If a target of Rowan's second ability is a legal target but an effect prevents the damage that would be dealt to it, that creature still can't block this turn.
No other card is named in this ruling.
#3October 4, 2019· Wizards of the Coast
Rowan's third ability can affect creatures you already control or ones that are already untapped. It will untap them if applicable and give them haste.
No other card is named in this ruling.
#4October 4, 2019· Wizards of the Coast
Gaining control of a creature doesn't cause you to gain control of any Auras or Equipment attached to it.
No other card is named in this ruling.

Interactions with other cards

These cards' text mentions Rowan, Fearless Sparkmage.

Rowan's Stalwarts

When this creature enters, you may search your library and/or graveyard for a card named Rowan, Fearless Sparkmage, reveal it, and put it into your hand. If you search your library this way, shuffle.