What it does
Shieldwall isn't an official Magic: The Gathering keyword—it doesn't appear in any released set or the comprehensive rules, so there's nothing to explain mechanically. If you saw it on a card, it's likely from a custom/homebrew set, a fan-made card, or a misremembering of a real ability.
You may be thinking of similar concepts: Banding (an old, notoriously complex keyword letting you control how combat damage from a band is assigned), Defender (a creature that can't attack, common on Walls), or Ward (protecting a permanent from being targeted). Each of these has real, distinct rules.
If "Shieldwall" comes from a specific custom card on Mythicwyrm or another platform, check that card's own rules text or reminder text, since custom abilities define themselves. Share the exact wording and I can break it down for you.
Iconic cards with Shieldwall
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