The bulk of those combinations are low-power, because a random Magic card is most likely to be out-moded, old, draft chaff, or all of the above
Echoes of Eternity can copy your mana rocks and nonlegendary creature spells, plus you turn removal spells like Null Elemental Blast into 2-for-1 bargains
The deck also comes with a plethora of instant and sorcery synergies
(More on that later.) Thirdly, there's a number of trading restrictions which you must abide by, such as only trading cards of the same rarity (one Diamond cards can only be traded for other one Diamond cards etc)
Dive into Magic 's most popular multiplayer format with five ready-to-play, 100-card decks, each with a unique two-color play style
If an effect instructs you to choose a card name, you may choose one of those names, but not all of them (though you might want to write it down and not just say it out loud)