Archaeomancer + High Tide + Snap

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Overview

With High Tide on the stack (or already resolved) and Archaeomancer and Snap available, the normal sequence is: Archaeomancer enters -> its triggered ability returns Snap from your graveyard to your hand (that trigger resolves on the stack) [608.2]. You may then cast Snap (an instant). When Snap resolves it returns a creature (for example, Archaeomancer) to its owner's hand and untaps up to two lands; because the untap effect doesn’t target you choose which lands to untap as Snap resolves [608.2], Ruling [2022-12-08]. Any Islands you tap for mana while High Tide’s effect is active produce additional when they are tapped [High Tide oracle text], including Islands that entered the battlefield after High Tide resolved Ruling [2022-12-08]. Snap itself is put into its owner’s graveyard as the final part of its resolution [608.2k], so replaying Archaeomancer can recur Snap again (Archaeomancer’s ETB can target a freshly-graved Snap) Ruling [2018-12-07].

The StackRules & CitationsDetails & Edge Cases

Step 1

Cast High Tide (instant). When it resolves, it creates a continuous effect until end of turn: whenever a player taps an Island for mana, that player adds an additional .

Step 2

Have Archaeomancer enter the battlefield (for example by casting it). When Archaeomancer enters, its triggered ability is put on the stack; when that trigger resolves it returns a target instant or sorcery card (for example Snap) from your graveyard to your hand [608.2].

Step 3

Cast Snap (instant) from your hand. When you pay for Snap you may tap Islands; because High Tide is active, each Island tapped for mana will produce an extra .

Step 4

When Snap resolves, it returns the targeted creature to its owner's hand (check the target is still legal on resolution [608.2b]), then untaps up to two lands. You choose which lands to untap as Snap resolves; those lands aren't targeted and they don't have to be lands you control Ruling [2022-12-08] [608.2].

Step 5

After Snap untaps Islands you may tap those Islands again for mana; each time you tap an Island while High Tide's effect is active you get the extra .

Step 6

Snap finishes resolving and is put into its owner's graveyard as the final part of the instant's resolution [608.2k].

Step 7

If you bounced Archaeomancer with Snap and then replay Archaeomancer, its ETB can target Snap now that Snap is in your graveyard Ruling [2018-12-07]; when that ETB resolves it returns Snap to your hand again, letting you repeat the sequence as long as you can pay the casting costs.

Resolution

Archaeomancer’s enter-the-battlefield trigger can return Snap from your graveyard to your hand; you can cast Snap and, as it resolves, untap up to two lands (you choose which, they aren’t targeted) Ruling [2022-12-08] and then tap those Islands to generate extra because High Tide is active (High Tide’s continuous effect applies when Islands are tapped) [608.2], Ruling [2022-12-08]. Snap is put into your graveyard as it finishes resolving [608.2k], so if you bounce Archaeomancer with that Snap and then replay Archaeomancer you can recur Snap again Ruling [2018-12-07]. Target checks (for Snap’s creature target) are performed on resolution [608.2b].