Reprinted 5x historically, most recently in 2023 -- no dedicated reprint sets or recent activity.
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Keldon Flamesage
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Oracle Data
Whenever this creature attacks, look at the top X cards of your library, where X is this creature's power. You may exile an instant or sorcery card with mana value X or less from among them. Put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost.
Official Judge Precedents
You may tap only one creature for an enlist ability of an attacking creature, and a single creature can't be tapped for more than one enlist ability.
The attacking player chooses whether to tap a creature for an enlist ability immediately after they tap the creatures that they have chosen to attack with. You can't choose to enlist a creature later.
If Keldon Flamesage leaves the battlefield in response to its triggered ability, use its power as it last existed on the battlefield to determine the value of X.
If the card has 
in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
To enlist a creature, that creature must be untapped, it must not be attacking (even if it has vigilance), and it must have haste or have been under that attacking player's control since the beginning of their current turn.
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 a kicker cost. If the card has any mandatory additional costs, you must pay those to cast the spell.
When a player taps a creature for an attacking creature's enlist ability, that attacking creature gets +X/+0 until end of turn, where X is the tapped creature's power. This is a triggered ability that goes on the stack immediately after attackers have been declared in the declare attackers step.
