Oxenguise, the Unyielding Yoke

Defender, Vigilance, Hexproof

This spell can't be countered

Shielded Resolve — Whenever a creature an opponent controls attacks you or a planeswalker you control, that creature’s controller must sacrifice a number of permanents equal to Oxenguard’s toughness. If they can’t, that creature is destroyed and its controller loses half their life total. If a creature is destroyed this way, you double your life total.