Yang Zing Unleashed

Continuous Trap

All monsters your opponent controls must attack, if able. During either player's Main Phase or Battle Phase: You can send this face-up card from your Spell & Trap Zone to the Graveyard; immediately after this effect resolves, Synchro Summon 1 Synchro Monster, using 1 or more "Yang Zing" monsters you control as Synchro Materials.

Rulings – Yugipedia

Printings:

Duelist Alliance: DUEA-EN075 (Common) - 2014-08-14
Duelist Alliance: Deluxe Edition: DUEA-ENDE2 (Ultra Rare) - 2014-09-11
2015 Mega-Tin Mega Pack: MP15-EN117 (Common) - 2015-09-17

Prices:

Cardmarket: 0.09 €
TCGplayer: $ 0.05