When Hostage Taker enters the battlefield, exile another target creature or artifact until Hostage Taker leaves the battlefield
One of the best ETB cards in red, Dualcaster Mage is a great example of a wizard that can take advantage of abilities like Naban, Dean of Iteration and Inalla, Archmage Ritualist
All of my five-color Commander decks are getting a copy of Urza
Rhox Faithmender is a four mana White 1/5 with lifelink, which is okay, but not great
That difficulty only becomes a greater burden as you add more colors, but by using lands with basic land types, you can mitigate this problem by making use of helpers like Polluted Delta, Skyshroud Claim, and Knight of the White Orchid to find them and put them onto the battlefield quickly
This demonstrates that not only can mechanics be tied to typal themes, the type itself can be a variant for the mechanic