
Instant
Permanents you control gain hexproof and indestructible until end of turn.

Different effect but Heroic alt; actually consider protection - skip

Gives your permanents indestructible until end of turn.

Green instant granting indestructible to your creatures plus card draw.

Cheap green instant giving your creatures indestructible against wraths.

One-mana green instant granting hexproof and indestructible to a permanent.

Cheap green instant protecting against targeted removal and counters.

Flexible instant that can also protect, but mainly removal—similar protective tool.

Green instant granting hexproof plus a pump to save a creature.
→ Destroy all noncreature permanents opponents control, Infinite magecraft triggers, Mass Land Denial
→ Infinite damage
→ Infinite +1/+1 counters on a creature, Infinite damage to one opponent
→ Infinite tapped Treasure tokens, Infinite damage to creatures
→ Infinite +1/+1 counters on a creature, Infinite damage to one opponent
→ Infinite +1/+1 counters on a creature, Infinite damage to one opponent
A battle with indestructible still loses defense counters as it's dealt damage. If it's a Siege, it will still be exiled when the last defense counter is removed from it, and its controller may still cast it transformed without paying its mana cost.
A planeswalker with indestructible still loses loyalty counters as it's dealt damage and will still be put into its owner's graveyard if its loyalty reaches 0.
The set of permanents affected by Heroic Intervention is determined as the spell resolves. Permanents you begin to control later in the turn won't gain hexproof and indestructible.