For examples Lightning, Security Sergeant needs to remain on the battlefield, Grolnok, the Omnivore can only add croak counters if the card went directly from the library to the graveyard (usually because it was milled), and Kaya the Inexorables emblem only triggers at your upkeep and looks at legendaries
If I feel the need to deal with a creature, I want it dead and gone, especially with how many things have powerful ETB's
Outlaws of Thunder Junction Desert Bloom decklist Desert Bloom has a little more mana than average for a 100-card deck
Someone who knows the Doctor Who mythology chime in here and say who to make Captain Sisay into a proxy off from in-universe beyond
Have or grant deathtouch Like black, green has access to the deathtouch keyword
The mana curve significantly affects the number of cards you can play in your decks