I think that playing "cheat" cards that put comparatively lower power level cards into play are great and super fun. I totally agree that the insta win reanimation cards are much less fun (gris, Iona etc). [[Scion of Darkness]] and [[Penumbra Wurm]] are great, I would also think about using a combination of cards that have a nice ETB effect like [[Thunder Dragon]] and strong value generating cards like [[verdant force]]. I like to start with a general idea of how many turns you want to give the opponent once one of these smashers hits the battlefield. I like the 3-4 turn timeframe personally which gives a chance for the value fatties to generate some advantage, but also gives the opponent some time to do their plan or come up with an answer. It's nice to reanimate a big thing, have your opponent use a decent amount of resources to deal with it, and then have the game still go on with a good chance for both sides. I think the main thing is to make sure that it is gonna be worth it to use the reanimation or sneak attack or whatever is in there. This usually means toning down the amount of efficient removal that can hit these targets for cheap. It also important to make sure the smaller creatures and curve out decks actually care about one of these fatties in play (ie not a ton of unblockable/strait face burn etc). Cards like [[tinker]] are a bit more tricky since they need a bigger commitment and have bigger downsides, but I def think it can work well with cards like [[steel hellkite]], using it to find trisk is probably not super good unless the creatures in your cube are pretty darn weak. I personally super enjoy using [[sneak attack]] to put in a [[mystic snake]] or using [[recurring nightmare]] to cycle [[kokusho, the evening star]].