Consul's Shieldguard: [Category 2] ETB yield is 2 Energy for 4 mana, then you can spend 1 Energy on an attack trigger to make another creature Indestructible
Since Ultra Ball is a staple card in many decks, the gold coloration card is one competitive players may want when trying to bling out their decks
During the Main Phase, if a monster is sent to your opponent's GY: You can send 1 Reptile monster from your Deck to the GY
There are even some Standard cards that do this like Kami of Whispered Hopes and Cradle Clearcutter
I believe this is wrong as I generally will only want to dilute my deck with these if my opponent presents a card that stops my game plan in near totality (Examples Above)
With such an impressive spread of Magic: The Gathering sets, it's understandably difficult to decide what MTG decks, cards, or boosters would make the best investment