Option A - Tylert doesn't attack back
this never gets anywhere, but i thought i'd mention it to be thorough. obviously if Tylert takes 2 every turn and never attacks back, they're gonna lose.
Option B - Tylert attacks back with 2 Myrs
attacking with both would let Reeplcheep double block, killing all the Myrs except 1 on Tylert's side. then Reeplcheep would get to attack with CF, and Tylert is forced to either block and let all the Myrs stay dead forever, or take a bunch of damage from however big CF is at this point. so double attacking is a losing line.
Option C - Tylert attacks back with 1 Myr
Reeplcheep has 3 different responses to this line, so i'll explore each of them.
Response 1 - Reeplcheep blocks and lets damage happen
this means Reeplcheep won't be able to attack with all 3 creatures on their turn, since one will be sick. but Tylert will have all 3 of his Myrs untapped and ready to block. this puts Reeplcheep on the defensive, and makes it hard to keep attacking. i think there are better lines for Reeplcheep.
Response 2 - Reeplcheep blocks and sacs the blocker before damage
again, Reeplcheep won't be able to attack with all 3 creatures, but one of Tylert's Myrs is now tapped. is this good enough? Reeplcheep can double attack, but Tylert can easily double block and not really suffer any consequences. this looks like it leads toward a draw, but let's explore the last option before we go too deep down this path.
Response 3 - Reeplcheep doesn't block
Reeplcheep takes 1, and now we're back where we started with Reeplcheep able to attack with all 3. but this is bad news for Tylert, since they already took 2 just to get to this point. trading 2 damage for 1 back and forth will certainly kill Tylert first, even with the 2 life buffer and possible attacks from the first 2 or 3 turns where the creatures were still being played. Reeplcheep only needs to connect for 2 11 times, so Tylert would've had to have done 9 damage to Reeplcheep already for this race to be good. Tylert can't keep making this exchange, so they'll have to block more than just CF.
Option A - Tylert doesn't attack back
again, this one goes nowhere. Tylert would've taken 1, dealt no damage back, then end up right back where they started with Reeplcheep attacking with everything. Tylert needs to attack to win.
Option B - Tylert attacks with 1 Myr
same 3 options as above for Reeplcheep, but they play out differently this time.
Response 1 - Reeplcheep blocks and lets damage happen
this response is a strictly worse version of response 2. moving on.
Response 2 - Reeplcheep blocks and sacs the blocker before damage
Reeplcheep has 1 summoning sick Myr, and Tylert has 1 tapped Myr. since response 3 (don't block) isn't a good life trade for Reeplcheep in this scenario, we need to explore this line more. triple attack is out, and Carrion Feeder can't block so there's no reason to ever leave it at home. that leaves us with only 2 follow-ups.
Follow-up 1 - Reeplcheep attacks with CF only
Tylert has to block, but they can do so at no real cost. Tylert can then attack with exactly 1 Myr on their own turn again and end up back in this same situation, with 2 blockers available, and either trading 1 for 1 with Reeplcheep's life total, or forcing Reeplcheep to block, preventing any alpha strikes. this should lead to a draw
Follow-up 2 - Reeplcheep attacks with CF and 1 Myr
Tylert can actually double block here just fine, at no cost. so this is effectively the same as follow-up 1. i think this line might actually force a draw.
Response 3 - Reeplcheep doesn't block
Reeplcheep takes 1. and we're back where we started, but this time it's a 1-for-1 life trade. this is not a winning line for Reeplcheep, since Tylert started at a higher life total.