1. Yes; in general, there is no limit to the number of planeswalkers you can control. But all planeswalker cards printed before Ixalan had their text changed to be legendary (C.R. 306.4), and all planeswalker cards printed since then, at the time of this writing, continue to be legendary though only by convention. (Currently the only exception is Personal Decoy.) And in general, if you end up controlling two or more legendary permanents with the same name, all but one of them (of your choice) will go to the graveyard as a state-based action (C.R. 704.5j).
2. In fact, you can target a planeswalker with Searing Spear; its latest Oracle text says "Searing Spear deals 3 damage to any target", which includes a planeswalker (C.R. 115.4, 108.1).
As long as they have different names, sure why not?
704.5j If a player controls two or more legendary permanents with the same name, that player
chooses one of them, and the rest are put into their owners’ graveyards. This is called the
“legend rule.”
306.4. Previously, planeswalkers were subject to a “planeswalker uniqueness rule” that stopped a player
from controlling two planeswalkers of the same planeswalker type. This rule has been removed and
planeswalker cards printed before this change have received errata in the Oracle card reference to
have the legendary supertype. Like other legendary permanents, they are subject to the “legend
rule” (see rule 704.5j).
2) Can I cast Searing Spear to damage a planeswalker?
Yes, a planeswalker can be the target for "Searing Spear deals 3 damage to any target."
108. Cards
108.1. Use the Oracle card reference when determining a card’s wording. A card’s Oracle text can be
found using the Gatherer card database at Gatherer.Wizards.com.
115.4. Some spells and abilities that refer to damage require “any target,” “another target,” “two
targets,” or similar rather than “target [something].” These targets may be creatures, players, or
planeswalkers. Other game objects, such as noncreature artifacts or spells, can’t be chosen.
Private Mod Note
():
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Why bother with mere rulings when so many answers can be found in the Rules?
I was actually looking at the old Searing Spear that says "... deals 3 damage to target creature or player." Would a spell that deals damage to target creature or player damage a planeswalker?
I was actually looking at the old Searing Spear that says "... deals 3 damage to target creature or player." Would a spell that deals damage to target creature or player damage a planeswalker?
Not necessarily. A spell or ability that can target only a "creature or player" (e.g., Firesong and Sunspeaker's triggered ability) can't target a planeswalker unless it's also a creature.
I was actually looking at the old Searing Spear that says "... deals 3 damage to target creature or player."
Searing Spear DOES NOT say "...target creature or player."
Not anymore.
Many (!) Magic cards have had their text updated over the years; players are expected to use cards according to their latest Oracle text, whatever is printed on the piece of cardboard they hold in their hand.
A large number of cards that used to say "target creature or player" have been updated to "any target".
By the way, old or new, all existing Searing Spear cards have been printed with the old text.
2) Can I cast Searing Spear to damage a planeswalker?
2. In fact, you can target a planeswalker with Searing Spear; its latest Oracle text says "Searing Spear deals 3 damage to any target", which includes a planeswalker (C.R. 115.4, 108.1).
EDIT: Edited slightly after comment 6 was posted.
EDIT (Mar. 2, 2023; Mar. 3, 2023): Edited.
As long as they have different names, sure why not?
There used to be a rule that cared about "planeswalker type" for this purpose (e.g., "Chandra" for Chandra, Novice Pyromancer and Chandra, Acolyte of Flame). That rule went away with the release of Ixalan.
Yes, a planeswalker can be the target for "Searing Spear deals 3 damage to any target."
I was actually looking at the old Searing Spear that says "... deals 3 damage to target creature or player." Would a spell that deals damage to target creature or player damage a planeswalker?
Not anymore.
Many (!) Magic cards have had their text updated over the years; players are expected to use cards according to their latest Oracle text, whatever is printed on the piece of cardboard they hold in their hand.
A large number of cards that used to say "target creature or player" have been updated to "any target".
By the way, old or new, all existing Searing Spear cards have been printed with the old text.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules