Ruby cards focus on offensive strategies, like using the Rush (able to challenge the turn the character is played) and Evasive (only allowing other Evasive ability characters to attack the character) abilities
Take your build through at least three games and watch for "dead" cards that stay in your hand
That sounds much nicer than explaining why someone has just traded away a perfectly good card at school for what appears to be a bent energy card and half a biscuit
MTGNexus, MTG.Design, and Magic Set Editor are all highly rated by users for their features such as user-friendly interfaces, customizable options, card organization capabilities, image rendering of the created cards, and exportation of entire sets for gameplay
A proper tracking system lets you: See what you own Identify missing cards Avoid accidental duplicates Plan purchases efficiently Which Collector Are You
Energy is an alternative resource system that debuted in the set Kaladesh in 2016 (damn it's scary to think that Kaladesh released almost a decade ago)