If X is rare (e.g., walls, creatures with flying, legendary creatures), they’re nearly unblockable.
Magic: The Gathering (MTG) , unblockable creatures are essential for breaking board stalls and ensuring combat damage triggers. The "best" unblockable creatures generally fall into three categories: cheap enablers, self-sufficient threats, and high-impact finishers.
Unblockable creatures are prized for consistent damage, carrying equipment/enchantments, and triggering “when deals combat damage to a player” abilities. The best ones balance low mana cost, evasion, and extra utility.