Each of these can help turn the tide of a game, and is to be feared
Honorable Mention #1 (#12) - Electric Revelation I know that it's not the same power level, but the first thing that Electric Revelation reminded me was of another flashback card powerhouse named Faithless Looting
To this end, Triskelion has proven the most fruitful, as it is a sizable threat on its own, while also offering the ability to shoot down opposing creatures and blockers
With Mockingbird you get the upside of a flying clone, and its wording means you're always spending a net-even amount of mana compared to the creature you copy
Maybe the best measure of a Magic card design is how helpless a fresh player is to the ideas that come to mind while reading it, despite what seems like very little English language input
(A regular Art card can be found in 30% of packs and a foil-stamped Signature Art card can be found in 5% of packs.) Each pack includes a combination of 14 cards of rarity Rare or higher and 35 Uncommon, 69 Common, and 1 Land cards