Bonehoard Dracosaur is big and has first strike, and it gives you two cards to play each turn, not to mention treasures or extra 3/1 tokens
Sutina, Speaker of the Tajuru is another reason to eschew the older ramp spells like Farhaven Elf or Cultivate in your deck
Once the ability is activated and the cost is paid, its too late to stop the ability from being activated by trying to remove the creature card from the graveyard
Crew 1 Adrestia's second ability will trigger only if it was crewed this turn by a creature that was an Assassin when it was tapped to pay the cost of Adrestia's crew ability
In 2022 however, prices for the rare holographic have bottomed out substantially
Most of these are effectively newcomers, like Raccoons, Otters, and Rabbits