Heliod, Sun-Crowned Heliod, Sun-Crowned deserves mention as a combo enabler
Another important pair of words on this card is nonland permanent, and I'm sure you know of great artifacts, enchantments, and planeswalkers that cost less than 3 and want a second chance
Gollum, Obsessed Stalker Gollum, Obsessed Stalker requires you to track a new thing during a game, and thats being hurt by it at least once
For gameplay strategy, this version of Stitch costs a lot of ink, but its defense score of eight makes it difficult to banish from play, giving a great opportunity for the player to get two lore each turn by questing if they choose
Typical choices include: untargetable or uncounterable creatures, creatures that benefit from being destroyed, and cards that can recur themselves or otherwise provide card advantage even from the graveyard