Provide examples of when I can play the card "drag under" discounted.

To play Drag Under with its cost reduction, you must play it from a zone other than your hand, as specified by its card text. Per Rule 356.4 and Rule 356.4.c, discounts are applied during the "Determine Total Cost" step of the play sequence.

Applying the Cost Reduction

The cost reduction triggers whenever a game effect allows you to play Drag Under from a zone other than your hand (such as the trash or deck). Because the reduction is tied to the zone from which it is played, it is applied after the card moves to the chain but before you pay its costs.

• When playing from the Trash: If an effect allows you to play a spell from your trash, Drag Under is played from a zone other than your hand, and the cost reduction is applied.
• When playing from the Deck: If an effect allows you to play Drag Under from your deck, it is played from a zone other than your hand, and the cost reduction is applied.
• When playing from Hand: The discount does not apply, as the condition "anywhere other than your hand" is not met.

Important Considerations

• Targeting and Deflect (FAQ #9710): Because Drag Under targets a unit, it is subject to the Deflect keyword. If you target a unit with Deflect, you must pay the additional Power cost required by that unit's Deflect value, in addition to the cost of Drag Under (after applying any applicable reductions).
• The "Play" Sequence: When playing the card, it moves from its current zone onto the chain (Rule 419.1). The cost reduction is determined after the card has moved to the chain but before you pay the costs (Rule 356.4.c).

Note: I could not fully verify this ruling against the retrieved rules.