Yes, if a creature enters the battlefield as a land, it triggers landfall. With both creatures out, the first land you play (or creature you cast) will trigger Zimone to let you manifest dread, then turn a creature face up (which could even be the one that you just manifested).

I think the key here is that the back side of Blex, Vexing Pest  ^Flip is not a permanent card. In the final example, Invasion of Kylem  ^Flip is entering as a copy of a creature. Because of how copy effects work, Valor's Reach Tag Team  ^Flip is also a copy of Bird Admirer  ^Flip, so it's a creature entering the battlefield. The rule still explicitly prevents it from entering, even though it's type is changed. Search for Blex  ^Flip is perpetually an artifact instead of a sorcery, but it's still on some level a sorcery card for the sake of being able to enter the battlefield.

They'll have a maximum hand size of 3 or less. When Shifting Woodland's ability resolves, the ability of Winter, Misanthropic Guide is generated with a new timestamp. Even though Shifting Woodland entered before Reliquary Tower, the ability in question has a later timestamp so will be applied after. Reliquary Tower will first remove the maximum hand size, then Winter will re-add it and reduce it, effectively winning out.

If a player casts Stifle in response to Strionic Resonator's activation targeting the same ability as the Resonator it will counter that ability removing it from the stack. That will cause the activation to no longer have a legal target when it tries to resolve, effectively countering both the original trigger and the activation.

As a note, Strionic Resonator would copy the landfall ability as a whole. When Omnath, Locus of Creation's ability resolves, it checks how many times the ability has resolved, not how many times it triggered, or which trigger it was. Copying the second trigger will make the copy add and make the actual trigger deal 4 damage to each opponent and each planeswalker you don't control, even though it was the second trigger, as it is now the third time the ability is resolving.

While in your graveyard Grist, the Hunger Tide can be the target of anything that targets creature cards in the graveyard, including spells like Reanimate. As a note, reanimation enchantments, like Animate Dead gain the ability "Enchant creature put onto the battlefield by [this aura]," since Grist is not a creature, it won't be legally enchanted, causing the aura to fall off and then Grist will be sacrificed before you have a chance to use any of it's abilities.

Yes, the targeted creature is returned to its owner's hand. Because the target is no longer on the battlefield, when Confusion in the Ranks' ability tries to resolve it won't have a valid target and will fail to resolve. The new creature will stay under it's original controller's control.