Lobelia, Defender of Bag End — ruling 1

You may look at these face-down exiled cards any time you wish. No other player may look at the face-down cards you exiled with Lobelia, Defender of Bag End, even if another player takes control of it.

Lobelia, Defender of Bag End — ruling 2

If Lobelia, Defender of Bag End leaves the battlefield, and later another Lobelia, Defender of Bag End enters the battlefield, it is a new object (even if the two were represented by the same card). You can't play cards exiled by the original Lobelia, Defender of Bag End with the second ability of the new Lobelia, Defender of Bag End.

Lobelia, Defender of Bag End — ruling 3

To play a card using the permission granted by the first mode of Lobelia, Defender of Bag End's activated ability, you must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can play a land from exile this way only during your main phase while the stack is empty, and only if you have an available land play remaining for the turn.

Lobelia, Defender of Bag End — ruling 4

If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.

Lobelia, Defender of Bag End — ruling 5

If the spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

Lobelia, Defender of Bag End : règles, fonctionnement et interactions (MTG)

Lobelia, Defender of Bag End 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

When Lobelia enters, look at the top card of each opponent's library and exile those cards face down. , Sacrifice an artifact: Choose one — • Until end of turn, you may play a card exiled with Lobelia without paying its mana cost. • Each opponent loses 2 life and you gain 2 life.

How it works : Lobelia, Defender of Bag End

Original English text — Wizards of the Coast / Scryfall

#1June 16, 2023· Wizards of the Coast
You may look at these face-down exiled cards any time you wish. No other player may look at the face-down cards you exiled with Lobelia, Defender of Bag End, even if another player takes control of it.
No other card is named in this ruling.
#2June 16, 2023· Wizards of the Coast
If Lobelia, Defender of Bag End leaves the battlefield, and later another Lobelia, Defender of Bag End enters the battlefield, it is a new object (even if the two were represented by the same card). You can't play cards exiled by the original Lobelia, Defender of Bag End with the second ability of the new Lobelia, Defender of Bag End.
No other card is named in this ruling.
#3June 16, 2023· Wizards of the Coast
To play a card using the permission granted by the first mode of Lobelia, Defender of Bag End's activated ability, you must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can play a land from exile this way only during your main phase while the stack is empty, and only if you have an available land play remaining for the turn.
No other card is named in this ruling.
#4June 16, 2023· Wizards of the Coast
If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, those must be paid to cast the spell.
No other card is named in this ruling.
#5June 16, 2023· Wizards of the Coast
If the spell has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
No other card is named in this ruling.