Deftblade Elite vs. Daring Skyjek vs. Oketra's Avenger.
Rhox Maulers vs. Stampeding Elk Herd vs. Rampaging Hippo
As humphrey said, Deftblade Elite is a one drop and a real role player as well. Early in the game you can snipe down X/1s and utility creatures and later in the game you have a Wall of Vapor for 2 mana a turn. The first mode goes nuts with pump. Daring Skyjek > Oketra's Avenger, but I really like the Avenger and would probably look for a different cut. Curve-wise I would consider cutting a 4-drop instead, e.g. Ondu Greathorn.
I really like the Elk. Having 3 additional power is not a big deal and permanent trample for the whole Team really is something.
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I'd say Hippo as you can keep more questionable opening hands with it (cycles sooner and does not have a color requirement). It's a stronger attacker (trample) and blocker that comes down a turn earlier. And these two aspects would over weigh the ability to fetch a land at instant speed.
Krosan Tusker is way better than Rampaging Hippo. The cycling mode is like a better version of Weave Fate (at least in the early game when it matters), which is way better than just cycling for a random card. I also couldn't disagree more about how Hippo lets you keep more questionable hands. Tusker actually fixes your mana and ensures you get your fourth mana source, Hippo only gives you a random card which may or may not help. If you play a deck with Hippo or Tusker and don't have a green mana source in your opening hand it's time for a mulligan anyway.
The only thing Hippo has going for it is the slightly better hard cast mode, but neither creature is impressive in that regard.
That said I think both cards have different purposes. You play Krosan Tusker mainly for the uncounterable instant speed Lay of the Land that replaces itself while the creature is a secondary mode you only use if the other mode wouldn't make sense anymore. Rampaging Hippo on the other hand is mainly a big and very unexciting creature you can cycle away for a relatively cheap cost if you don't have the mana to cast it.
Or in other words you could say Krosan Tusker is a 3 cmc card with a 7 cmc secondary mode while Hippo is a 6 cmc card with a 2 cmc secondary mode.
Krosan Tusker is just too good at any point of the game. I think the Rampaging Hippo is Green's best six drop by a decent margin, however; the Tusker just does too much when you need his fixing and card draw early.
I'm currently constructing a Masters Cube and the Tusker just had to go in as a common slot. He does a lot and is just an all round versatile card that can find a home in many decks.
Unless you have some Goblin tribal I would go the scrapper.
Unless you have some enchantment/+1+1 themes, Rhonas's Stalwart is an easy pick over Wandering Wolf.
Kozilek's Predator supports sacrifice and swarm and has well rounded stats. The Oasis Ritualist is a pure ramp card that holds the fort when you don't need the mana and also fixes. The Predator will find a home in more decks.
Although 4/4 reach and vigilance is awesome, I would keep the variety of one of the other options. Lifecraft Cavalry is a nice payoff for any sacrifice archetypes as well as +1+1 synergies.
Both are 1/1 creature that gives additional value when killed. One gives flying creature, other lifelink creature. One has lifelink from the start and can give value even if goes to the graveyard by other means, the other doesn't cost mana to give additional value.
I won a HOU draft basically by enchanting the cat with a blue cartouche and defending it with tricks and counters. It surprised me.
More interested in Emerge but would probably play Benevolent Bodyguard over either. Yes it's an onboard trick but it also wears equipment and can go block-protect if that's a thing you want to be doing.
Well it's the question whether you want an archetype card in form of the Tiger that pairs up great with auras or just a random card that is a mix of Borderland Ranger and Nessian Courser.
I myself am pretty curious about the last colorless slot I currently have available. Choose 1: Cathodion: A pretty solid creature that can fit into pretty much any kind of deck, but isn't amazing in any way.
vs. Mind Stone: Colorless ramp with the option to be cycled away later is definitely rock solid, but with access to Signets, that actually fix your mana I'm not sure if it's necessary and better than the other cards competing for this slot.
vs. Scion of Ugin: Different than Cathodion this doesn't fit into any deck, but for the decks, that want it it's a lot better. It can be a very decent win-con for any kind of control deck, especially red control decks, that usually don't have great finishers. Due to flying it can also be used as a very unique finisher for green decks, that are looking something to do with their mana, even though I'm not actually heavily supporting ramp as an archetype anymore.