Both Chromatic Orrery and Timeless Lotus make it a lot easier to consistently recast Tom Bombadil if your opponents keep removing him
Ayula, Queen Among Bears cares about bear EtB (Enter the Battlefield) triggers so the obvious choice is to fill our deck with enough bears to make the most of our commander abilities
Just remember that it's a special energy, so you can't fetch it through basic energy fetch cards
Dampen Thought is a famous example of this mechanic
One of blue's best ETB cards if you're focusing on typal strategies, this enchantment triggers when your creatures attack as well as when they enter, and you mitigate the risk of an expensive do-nothing enchantment since it replaces itself several times over the turn it comes into play
Rarity and scarcity potential : The High Class Pack designation, the new rarities, and the focused theme suggest that certain pull ratios will be lower and chase cards could be expensive over time