The way Yanmega ex works is that its Buzz Boost ability lets you search your deck for three Grass Energy and attach it to the card when it switches from the Bench to the Active spot
Look, its easy to fill a Modern deck with cheap interaction and fetchlands, kill and counter everything the opponent does, and then start chaining Dig Through Times
Here's a fun detail: This card has the Flashback mechanic, because after all, we see this scene in a flashback
Yugi and Kaiba each managed to Summon their respective God cards
To do this, place the cards according to the principles that you like best
Tomik, Distinguished Advokist has a great rate, plus some not-so-incidental interactive rules text