The biggest problem with Sylvan Advocate in this format is that the Bant Company decks are built to beat the card by playing larger creatures, going around it, or using their only removal spell in Dromokas Command
When you are gone, will anyone remember your story? Unknown Illustrated by Randy Vargas Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
even more expensive cards like Ravenous Chupacabra are fine to throw away once you get that enters ability
The zombie lurching forwards in the background is covered with mottled, green flesh sloughing off his body, while the one in the foreground has his stomach burst open and his intestines are spilling out
Robot is perhaps the most prolific example
This all changed with the printing of Deathmist Raptor in Dragons of Tarkir , a card that was powerful enough to encourage dedicated morph decks that included all three iterations of the mechanic