They are optimized for Altered as well as a vast variety of TCGs and LCGs
Also, Whenever a creature is put into an opponents graveyard from the battlefield, you gain life equal to its toughness. The rulings around MTG have changed since this card was first printed, and the short of that is that it actually affects all opponents, which makes it incredibly good at gaining you life
Preferably more, of course
Jeskai decks reward tight sequencing and smart resource management, chaining spells together for maximum effect
If theres a card that sums up where I want to be in Commander these days, its Fall of the First Civilization
Alongside Dimir Spybug and Thoughtbound Phantasm, you get to turn the corner in an instant at the low cost of some life and a free Demonic Tutor