Valor's Reach

Whenever your team attacks with exactly two creatures, those creatures gain double strike until end of turn. Whenever chaos ensues, untap up to two target creatures your team controls. If it's a main phase, there is an additional combat phase after this phase, followed by an additional main phase.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o9lpl6b31pb1h01nldxiy.