7, 10, and 14 have plenty of modern references when it comes to Magic-style art, but youre pulling from a comparatively smaller pool for 6
If I had to only pick one card for Modern, itd be this one
It's deserving of a spot on the list
That is counterintuitive when your goal is making something more accessible
For example, Annihilate will be card advantage if it resolves normally targeting a creature an opponent controlsyou lose one card from your hand but you also draw a card, for a net gain of zero cards, and your opponent loses one card, so you're up one card relative to them
Fierce Guardianship is one such counterspell that sweetens the deal by eliminating its mana cost if your commander is on the board--something that will likely be the case when you want to cast this spell anyway