I didn't realize that spells had a monopoly on "disposable resources" and "lists".
They don't, but if what you really want deep down is for martials to have powers that are equal to spells again, you're not talking about the Warlord, you're talking about 5e's choice to not open the can of worms that is martial dailies.
Mechanically, this is a fix:
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Martial Exploits
You know how to produce extraordinary effects that don't rely on magic. Though the effects mimic spells, you produce these wonders using your personal charm and training, not magic. For you, spells are called exploits, and instead of casting a spell, you use a martial exploit. Using a martial exploit follows all the rules for casting a spell, except as discussed below.
It's Not Magic
Martial exploits are not subject to effects that interfere with magic or spellcasting.
Required Components
You produce your exploit's effects through your own charismatic appeal and ability to command others. You must be able to speak when you use an exploit with this feature (meaning the exploit has a V component when you use it). Your exploits only require verbal components.
At-Will Powers (0-Level Exploits)
At 1st level, you know two at-will powers of your choice chosen from the warlord martial exploit list {
this list includes warlordy spells}. At higher levels, you learn additional at-will powers of your choice, as shown in the At-Will Powers Known column of the Warlord table.
When you gain a level in this class, you can replace one of the at-will powers you know with another at-will power from the warlord exploit list.
Exploit Slots
The Warlord table shows how many exploit slots you have to use your warlord exploits of 1st level and higher. To use one of these martial exploits, you must expend a slot of the exploit's level or higher. You regain all expended exploit slots when you finish a long rest.
Knowing Exploits of 1st Level and Higher
You know two 1st-level exploits of your choice from the warlord exploit list.
The Exploits Known column of the Warlord table shows when you learn more warlord exploits of your choice. Each of these exploits must be of a level for which you have exploit slots. Additionally, when you gain levels in this class, you can choose one of the warlord exploits you know and replace it with another exploit from the warlord exploit list, which also must be of a level for which you have exploit slots.
Exploit Ability
Charisma is your martial exploit ability for your warlord exploits, since the power of your exploits relies on your ability to inspire and lead others. Your martial exploit ability functions as your spellcasting ability for your martial exploits. You use your Charisma whenever an exploit refers to your spellcasting ability. In addition, you use your Charisma modifier when setting the saving throw DC for a warlord exploit you use and when making an attack roll with one
Exploit Save DC = 8 + your proficiency bonus + your Charisma modifier
Exploit Attack Modifier = your proficiency bonus + your Charisma modifier
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Slap that on a bard or a paladin and maybe lightly curate your spell selection to rule out anything with special effects (or not! the 4e principle of martial powers being the same as magic can still hold and there's no reason your warlord can't use
faerie fire and call it "cover everyone with flour" if you want.)
I don't think this would be an acceptable solution, but I present it to highlight that we're not just talking about "warlords," here, we're talking about martial powers, and that's a different conversation.
