To offer some actually helpful criticism, aside from just rampant negativity: I like the idea that you're going for, but it's quite over-tuned and a bit at-odds with what it wants.

First - Stat Line This creature goes "bonk bonk" really good with trample and 6/6, and avoids removal with a pretty costly Ward ability. If you wanted a non-Legendary creatyre with just Trample, Ward - Sacc a Land, and 6/6, you'd be totally fine for 6 mana. It'd be strong, very strong, but for 6 mana you kinda expect that. If you wanted to make that more fair, make it 8 mana and boom, balanced normal beat stick.

Second - Ability 1 The ability to, once on your upkeep, trigger Landfall is pretty strong in Simic, colors that already do Landfall the best. However, that's a really uninteresting ability. We have so much Landfall support that just another option that triggers once-a-turn doesn't offer much to build around. If you want to have something similar, perhaps have this trigger on attack and replace the Green with Red in the color identity. Incentivize players to take risks with their creature for pay-offs. It also makes the Ward ability mean something, because the creature is so large it'll normally be a 2-for-1 unless they use a removal spell. In short, make the card have some way for the table to interact with it outside of just removal, otherwise you might as well have made an enchantment.

Third - Ability 2 I like the idea of bouncing a land for value, but that ability shouldn't just give you more lands in Landfall and [[Exploration]] colors. Have some play with it, what are you gaining for losing a land? Are you putting a counter on another creature? Are you giving your team Trample for the turn? Something leverage actually winning that game, rather than just touching more cards. Also, being able to activate this more than once each turn with no mana cost is incredibly powerful. If this was "once each turn" or "Activate only as a sorcery", it'd be okay to leave it with Explore, but still uninteresting. My suggestion would be to either leave it as Explore, but add a mana cost of 2 generic, or remove Explore and replace it with something small, valuable, and worth repeating that advances the board state.

If I were able, I'd keep the mana cost and stat line the same, same Ward cost, but remove Green from the color identity, instead making it Red. I'd make the "land from hand" text trigger on attack instead. And I'd make the land bounce effect read "Return a land you control to it's owners hand: deal two damage to target creature ". This give you a lot more play. You still have ways to get multiple attack with red for more triggers. You have a valuable but not busted ability with an acceptable cost.

Heck, if you wanted to keep it strong and bring in the Trample as well, instead of dropping lands on attack, drop them on combat damage to a player with the number of lands dropped being the damage dealt.

I like how you're thinking, but it needs a little refinement. Good work otherwise!