Two cards, one slot. Heroic Intervention and Teferi's Protection get compared constantly because they compete for the same job in Comman...
Two cards, one slot. Heroic Intervention and Teferi's Protection get compared constantly because they compete for the same job in Commander decks — but they are not the same card, and the right answer depends on what your deck is already doing. This comparison works from the exact oracle text, mana value, and type line of both, and ends with a verdict by deck type.
Heroic Intervention, read exactly
Heroic Intervention is a Instant (mana cost {1}{G}; rarity: rare; most recent printing listed by Scryfall: Commander Masters):
Permanents you control gain hexproof and indestructible until end of turn.
Teferi's Protection, read exactly
Teferi's Protection is a Instant (mana cost {2}{W}; rarity: rare; most recent printing listed by Scryfall: Double Masters 2022):
Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.)
Exile Teferi's Protection.
Check both wordings any time in the MTGBrew card database, and prototype the swap in the MTGBrew AI deck builder before you commit a slot to either.
The verdict, by deck type
Decks that win by attacking want the protection that keeps their board in play and swinging; the one-sided shield that leaves creatures on the battlefield is their card. Decks that win from a fragile combo turn, or that play from behind against wipe-heavy tables, want the full phase-out — the version that also protects their life total and makes everything untouchable, at the price of a higher mana cost and a board that sits out a round of combat. Midrange creature lists usually prefer the cheaper, board-preserving option; control and combo lists pay the premium for the complete reset.
If this topic is on your bench, keep going with Vampiric Tutor in Commander: What It Does and Which Decks Want It — it covers the neighbouring decisions from a different angle, and the two pieces together give you a fuller picture than either one alone.
The short version
Neither card wins in the abstract. The one that wins in your deck is the one whose text matches the board states your list already creates on ordinary turns — and now you have both texts in front of you to judge that honestly.
Keep reading
Keep reading: Vampiric Tutor in Commander: What It Does and Which Decks Want It and The First Sliver Commander Guide: How the Deck Actually Wins.
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