Wizards of the Coast has been printing fixed versions of Reserved List cards ever since the Reserved List was created
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Virtue of Knowledge is just a more expensive, color-shifted Panharmonicon
Thinking about your side of the field, cards like End the Festivities, Forked Bolt, and Play with Fire are burn spells that are very good to deal with convoke decks or small creature/weenie decks, while not being useless against midrange or control
In the case of Sazh's Chocobo, when a land hits the battlefield, it gets a +1/+1 counter , meaning that the more lands you can play each turn, the more counters it gets, and despite starting as a 0/1 creature, it can become quite the hulking beast very quickly
Cloud's last ability reduces only the amount of generic mana you pay for equip abilities that target Cloud
